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<lastmod>2026-10-28T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/learn/technology/how-does-the-internet-work</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/technology/how-does-the-internet-work" />
<video:video>
<video:title>How does the internet work?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/internet.jpg</video:thumbnail_loc>
<video:description>A page is cut into numbered, addressed packets. Routers forward each one hop by hop along any working path; your device reorders them and re-requests lost ones.</video:description>
<video:player_loc>https://aivoken.com/films/internet/index.html</video:player_loc>
<video:duration>35</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/zh/learn/technology/how-does-the-internet-work</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/technology/how-does-the-internet-work" />
<video:video>
<video:title>互联网是怎样工作的？</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/internet.jpg</video:thumbnail_loc>
<video:description>页面被切成编了号、写好地址的数据包。路由器沿任何可用的路径把每个包逐跳转发出去；你的设备再把它们排回原序，丢了的就再要一次。</video:description>
<video:player_loc>https://aivoken.com/films/internet/zh/index.html</video:player_loc>
<video:duration>35</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/es/learn/technology/how-does-the-internet-work</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/technology/how-does-the-internet-work" />
<video:video>
<video:title>¿Cómo funciona Internet?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/internet.jpg</video:thumbnail_loc>
<video:description>Una página se corta en paquetes numerados y con dirección. Los enrutadores reenvían cada uno salto a salto por cualquier ruta que funcione; tu dispositivo los reordena y vuelve a pedir los que se pierden.</video:description>
<video:player_loc>https://aivoken.com/films/internet/es/index.html</video:player_loc>
<video:duration>35</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/ja/learn/technology/how-does-the-internet-work</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/technology/how-does-the-internet-work" />
<video:video>
<video:title>インターネットはどう動くのか</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/internet.jpg</video:thumbnail_loc>
<video:description>ページは番号と宛先付きのパケットに切られる。ルーターは各パケットを、動いている経路に沿ってホップごとに転送する。端末は並べ直し、失くしたものは再要求する。</video:description>
<video:player_loc>https://aivoken.com/films/internet/ja/index.html</video:player_loc>
<video:duration>35</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/fr/learn/technology/how-does-the-internet-work</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/technology/how-does-the-internet-work" />
<video:video>
<video:title>Comment fonctionne Internet ?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/internet.jpg</video:thumbnail_loc>
<video:description>Une page est découpée en paquets numérotés et adressés. Les routeurs font suivre chacun, saut par saut, par n'importe quel chemin en état de marche ; votre appareil les remet dans l'ordre et redemande ceux qui sont perdus.</video:description>
<video:player_loc>https://aivoken.com/films/internet/fr/index.html</video:player_loc>
<video:duration>35</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/de/learn/technology/how-does-the-internet-work</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/technology/how-does-the-internet-work" />
<video:video>
<video:title>Wie funktioniert das Internet?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/internet.jpg</video:thumbnail_loc>
<video:description>Eine Seite wird in nummerierte, adressierte Pakete zerlegt. Router leiten jedes davon Sprung für Sprung über jeden funktionierenden Weg weiter; das empfangende Gerät sortiert sie neu und fordert verlorene erneut an.</video:description>
<video:player_loc>https://aivoken.com/films/internet/de/index.html</video:player_loc>
<video:duration>35</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/pt/learn/technology/how-does-the-internet-work</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/technology/how-does-the-internet-work" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/technology/how-does-the-internet-work" />
<video:video>
<video:title>Como funciona a Internet?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/internet.jpg</video:thumbnail_loc>
<video:description>Uma página é cortada em pacotes numerados e endereçados. Roteadores repassam cada um salto por salto por qualquer caminho que funcione; seu dispositivo os reordena e pede de novo os que se perderam.</video:description>
<video:player_loc>https://aivoken.com/films/internet/pt/index.html</video:player_loc>
<video:duration>35</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/learn/money/what-is-inflation</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/money/what-is-inflation" />
<video:video>
<video:title>What is inflation?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/inflation.jpg</video:thumbnail_loc>
<video:description>Inflation is the average rise in prices, measured by repricing one basket of goods. At 3% a year, $100 of cash buys about $74 of today’s goods in ten years.</video:description>
<video:player_loc>https://aivoken.com/films/inflation/index.html</video:player_loc>
<video:duration>35</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/zh/learn/money/what-is-inflation</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/money/what-is-inflation" />
<video:video>
<video:title>什么是通胀？</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/inflation.jpg</video:thumbnail_loc>
<video:description>通胀是物价的平均上涨，通过给同一篮子商品重新计价来衡量。按每年 3% 计算，$100 现金十年后只能买到如今约 $74 的商品。</video:description>
<video:player_loc>https://aivoken.com/films/inflation/zh/index.html</video:player_loc>
<video:duration>35</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/es/learn/money/what-is-inflation</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/money/what-is-inflation" />
<video:video>
<video:title>¿Qué es la inflación?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/inflation.jpg</video:thumbnail_loc>
<video:description>La inflación es el aumento promedio de los precios, medido recalculando el precio de una misma canasta de bienes. Con un 3% anual, $100 en efectivo compran en diez años unos $74 de los bienes de hoy.</video:description>
<video:player_loc>https://aivoken.com/films/inflation/es/index.html</video:player_loc>
<video:duration>35</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/ja/learn/money/what-is-inflation</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/money/what-is-inflation" />
<video:video>
<video:title>インフレとは何か</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/inflation.jpg</video:thumbnail_loc>
<video:description>インフレとは、ひとつの買い物かごを再値付けして測る、物価の平均上昇。年3%なら、現金のまま持った$100は10年後に今日の商品の約$74分しか買えない。</video:description>
<video:player_loc>https://aivoken.com/films/inflation/ja/index.html</video:player_loc>
<video:duration>35</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/fr/learn/money/what-is-inflation</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/money/what-is-inflation" />
<video:video>
<video:title>Qu'est-ce que l'inflation ?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/inflation.jpg</video:thumbnail_loc>
<video:description>L'inflation, c'est la hausse moyenne des prix, mesurée en reprixant un panier de biens. À 3% par an, 100 $ en liquide n'achètent plus qu'environ 74 $ des biens d'aujourd'hui dans dix ans.</video:description>
<video:player_loc>https://aivoken.com/films/inflation/fr/index.html</video:player_loc>
<video:duration>35</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/de/learn/money/what-is-inflation</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/money/what-is-inflation" />
<video:video>
<video:title>Was ist Inflation?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/inflation.jpg</video:thumbnail_loc>
<video:description>Inflation ist der durchschnittliche Anstieg der Preise, gemessen, indem ein Warenkorb neu bewertet wird. Bei 3% im Jahr kaufen 100 $ Bargeld in zehn Jahren noch Waren im Wert von etwa 74 $ von heute.</video:description>
<video:player_loc>https://aivoken.com/films/inflation/de/index.html</video:player_loc>
<video:duration>35</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/pt/learn/money/what-is-inflation</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/money/what-is-inflation" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/money/what-is-inflation" />
<video:video>
<video:title>O que é inflação?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/inflation.jpg</video:thumbnail_loc>
<video:description>Inflação é a alta média dos preços, medida ao reprecificar uma cesta de bens. A 3% ao ano, $100 em dinheiro compram cerca de $74 dos bens de hoje em dez anos.</video:description>
<video:player_loc>https://aivoken.com/films/inflation/pt/index.html</video:player_loc>
<video:duration>35</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/learn/body/why-do-we-sleep</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/body/why-do-we-sleep" />
<video:video>
<video:title>Why do we sleep?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/sleep.jpg</video:thumbnail_loc>
<video:description>Sleep runs in 90-minute cycles that clean and repair the brain and file the day’s memories, timed by rising sleep pressure and a 24-hour body clock.</video:description>
<video:player_loc>https://aivoken.com/films/sleep/index.html</video:player_loc>
<video:duration>36</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/zh/learn/body/why-do-we-sleep</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/body/why-do-we-sleep" />
<video:video>
<video:title>我们为什么要睡觉？</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/sleep.jpg</video:thumbnail_loc>
<video:description>睡眠以 90 分钟为周期循环运转，清洁并修复大脑，把一天的记忆归档；入睡时机由不断上升的睡眠压力和 24 小时生物钟决定。</video:description>
<video:player_loc>https://aivoken.com/films/sleep/zh/index.html</video:player_loc>
<video:duration>36</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/es/learn/body/why-do-we-sleep</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/body/why-do-we-sleep" />
<video:video>
<video:title>¿Por qué dormimos?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/sleep.jpg</video:thumbnail_loc>
<video:description>El sueño avanza en ciclos de 90 minutos que limpian y reparan el cerebro y archivan los recuerdos del día, pautados por la presión de sueño creciente y un reloj corporal de 24 horas.</video:description>
<video:player_loc>https://aivoken.com/films/sleep/es/index.html</video:player_loc>
<video:duration>36</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/ja/learn/body/why-do-we-sleep</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/body/why-do-we-sleep" />
<video:video>
<video:title>なぜ私たちは眠るのか</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/sleep.jpg</video:thumbnail_loc>
<video:description>睡眠は90分の周期で巡り、脳を洗浄・修理し、1日の記憶を整理する。その時刻は、高まる睡眠圧力と24時間の体内時計が決める。</video:description>
<video:player_loc>https://aivoken.com/films/sleep/ja/index.html</video:player_loc>
<video:duration>36</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/fr/learn/body/why-do-we-sleep</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/body/why-do-we-sleep" />
<video:video>
<video:title>Pourquoi dort-on ?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/sleep.jpg</video:thumbnail_loc>
<video:description>Le sommeil suit des cycles de 90 minutes qui nettoient et réparent le cerveau et rangent les souvenirs de la journée, rythmés par la pression de sommeil qui monte et une horloge corporelle de 24 heures.</video:description>
<video:player_loc>https://aivoken.com/films/sleep/fr/index.html</video:player_loc>
<video:duration>36</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/de/learn/body/why-do-we-sleep</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/body/why-do-we-sleep" />
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<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/body/why-do-we-sleep" />
<video:video>
<video:title>Warum schlafen wir?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/sleep.jpg</video:thumbnail_loc>
<video:description>Schlaf läuft in Zyklen von 90 Minuten, die das Gehirn reinigen und reparieren und die Erinnerungen des Tages sortieren, getaktet von steigendem Schlafdruck und einer 24-Stunden-Uhr im Körper.</video:description>
<video:player_loc>https://aivoken.com/films/sleep/de/index.html</video:player_loc>
<video:duration>36</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/pt/learn/body/why-do-we-sleep</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/body/why-do-we-sleep" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/body/why-do-we-sleep" />
<video:video>
<video:title>Por que dormimos?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/sleep.jpg</video:thumbnail_loc>
<video:description>O sono corre em ciclos de 90 minutos que limpam e consertam o cérebro e arquivam as memórias do dia, regulados pela pressão do sono, que sobe, e por um relógio biológico de 24 horas.</video:description>
<video:player_loc>https://aivoken.com/films/sleep/pt/index.html</video:player_loc>
<video:duration>36</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/learn/how-things-work/how-does-electricity-flow</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/how-things-work/how-does-electricity-flow" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/how-things-work/how-does-electricity-flow" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/how-things-work/how-does-electricity-flow" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/how-things-work/how-does-electricity-flow" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/how-things-work/how-does-electricity-flow" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/how-things-work/how-does-electricity-flow" />
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<video:video>
<video:title>How does electricity flow?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/electric.jpg</video:thumbnail_loc>
<video:description>A voltage tilts the random jitter of a metal’s free electrons into a drift. Round a closed loop that drift is current; resistance turns it into heat and light.</video:description>
<video:player_loc>https://aivoken.com/films/electric/index.html</video:player_loc>
<video:duration>42</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/zh/learn/how-things-work/how-does-electricity-flow</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/how-things-work/how-does-electricity-flow" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/how-things-work/how-does-electricity-flow" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/how-things-work/how-does-electricity-flow" />
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<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/how-things-work/how-does-electricity-flow" />
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<video:video>
<video:title>电流是怎样流动的？</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/electric.jpg</video:thumbnail_loc>
<video:description>电压把金属中自由电子的随机抖动偏成一股缓慢的漂移。绕着闭合回路，这股漂移就是电流；电阻再把它变成热和光。</video:description>
<video:player_loc>https://aivoken.com/films/electric/zh/index.html</video:player_loc>
<video:duration>42</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<loc>https://aivoken.com/es/learn/how-things-work/how-does-electricity-flow</loc>
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<video:video>
<video:title>¿Cómo fluye la electricidad?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/electric.jpg</video:thumbnail_loc>
<video:description>Un voltaje inclina el temblor aleatorio de los electrones libres de un metal hasta convertirlo en una deriva. En un circuito cerrado esa deriva es la corriente; la resistencia la convierte en calor y luz.</video:description>
<video:player_loc>https://aivoken.com/films/electric/es/index.html</video:player_loc>
<video:duration>42</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<loc>https://aivoken.com/ja/learn/how-things-work/how-does-electricity-flow</loc>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/how-things-work/how-does-electricity-flow" />
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<video:video>
<video:title>電気はどう流れるのか</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/electric.jpg</video:thumbnail_loc>
<video:description>電圧が金属の自由電子の不規則な揺れをドリフトへ傾ける。閉じた回路を巡るその流れが電流で、抵抗はそれを熱と光に変える。</video:description>
<video:player_loc>https://aivoken.com/films/electric/ja/index.html</video:player_loc>
<video:duration>42</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/how-things-work/how-does-electricity-flow" />
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<video:video>
<video:title>Comment l'électricité circule-t-elle ?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/electric.jpg</video:thumbnail_loc>
<video:description>Une tension oriente l'agitation désordonnée des électrons libres d'un métal en une dérive. Dans une boucle fermée, cette dérive est un courant ; la résistance la transforme en chaleur et en lumière.</video:description>
<video:player_loc>https://aivoken.com/films/electric/fr/index.html</video:player_loc>
<video:duration>42</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/de/learn/how-things-work/how-does-electricity-flow</loc>
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<video:video>
<video:title>Wie fließt Strom?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/electric.jpg</video:thumbnail_loc>
<video:description>Eine Spannung kippt das zufällige Zittern der freien Elektronen eines Metalls in eine Drift. Im geschlossenen Kreis ist diese Drift der Strom; Widerstand macht daraus Wärme und Licht.</video:description>
<video:player_loc>https://aivoken.com/films/electric/de/index.html</video:player_loc>
<video:duration>42</video:duration>
</video:video>
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<video:video>
<video:title>Como a eletricidade flui?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/electric.jpg</video:thumbnail_loc>
<video:description>Uma voltagem inclina o agito aleatório dos elétrons livres de um metal em uma deriva. Em um circuito fechado, essa deriva é a corrente; a resistência a transforma em calor e luz.</video:description>
<video:player_loc>https://aivoken.com/films/electric/pt/index.html</video:player_loc>
<video:duration>42</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<url>
<loc>https://aivoken.com/learn/history/sun-tzus-art-of-war</loc>
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<video:video>
<video:title>Sun Tzu's Art of War in four ideas</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/artofwar.jpg</video:thumbnail_loc>
<video:description>Sun Tzu's classic in four ideas: win without fighting, know both sides, wage war by deception, and move like water around the ground you meet.</video:description>
<video:player_loc>https://aivoken.com/films/artofwar/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<url>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/sun-tzus-art-of-war" />
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<video:video>
<video:title>《孙子兵法》的四个核心思想</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/artofwar.jpg</video:thumbnail_loc>
<video:description>《孙子兵法》的四个核心思想：不战而胜、知己知彼、兵者诡道，以及像水一样随地而动。</video:description>
<video:player_loc>https://aivoken.com/films/artofwar/zh/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
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<loc>https://aivoken.com/es/learn/history/sun-tzus-art-of-war</loc>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/sun-tzus-art-of-war" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/sun-tzus-art-of-war" />
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<video:thumbnail_loc>https://aivoken.com/samples/artofwar.jpg</video:thumbnail_loc>
<video:description>El clásico de Sun Tzu en cuatro ideas: vencer sin combatir, conocer a los dos bandos, hacer la guerra con engaño y moverse como el agua alrededor del terreno que encuentras.</video:description>
<video:player_loc>https://aivoken.com/films/artofwar/es/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<loc>https://aivoken.com/ja/learn/history/sun-tzus-art-of-war</loc>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/sun-tzus-art-of-war" />
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<video:thumbnail_loc>https://aivoken.com/samples/artofwar.jpg</video:thumbnail_loc>
<video:description>『孫子の兵法』を4つの考えで読む。戦わずして勝つ、敵も味方も知る、戦は詭道、そして出会う地に合わせて水のように動くこと。</video:description>
<video:player_loc>https://aivoken.com/films/artofwar/ja/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
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<loc>https://aivoken.com/fr/learn/history/sun-tzus-art-of-war</loc>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/sun-tzus-art-of-war" />
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<video:video>
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<video:thumbnail_loc>https://aivoken.com/samples/artofwar.jpg</video:thumbnail_loc>
<video:description>Le classique de Sun Tzu en quatre idées : gagner sans combattre, connaître les deux camps, faire la guerre par la ruse, et se mouvoir comme l'eau autour du terrain rencontré.</video:description>
<video:player_loc>https://aivoken.com/films/artofwar/fr/index.html</video:player_loc>
<video:duration>28</video:duration>
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<video:video>
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<video:thumbnail_loc>https://aivoken.com/samples/artofwar.jpg</video:thumbnail_loc>
<video:description>Sunzis Klassiker in vier Ideen: ohne Kampf siegen, beide Seiten kennen, mit Täuschung Krieg führen und wie Wasser um das Gelände herumfließen, das du triffst.</video:description>
<video:player_loc>https://aivoken.com/films/artofwar/de/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
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<loc>https://aivoken.com/pt/learn/history/sun-tzus-art-of-war</loc>
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<video:video>
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<video:description>O clássico de Sun Tzu em quatro ideias: vencer sem lutar, conhecer os dois lados, fazer a guerra com engano e mover-se como a água ao redor do terreno que se encontra.</video:description>
<video:player_loc>https://aivoken.com/films/artofwar/pt/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
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<video:title>Machiavelli's The Prince in four ideas</video:title>
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<video:description>Machiavelli's 1513 manual in four ideas: hold power by skill against fortune's floods, be feared without hatred, and seem virtuous while staying armed.</video:description>
<video:player_loc>https://aivoken.com/films/prince/index.html</video:player_loc>
<video:duration>28</video:duration>
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<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<video:thumbnail_loc>https://aivoken.com/samples/prince.jpg</video:thumbnail_loc>
<video:description>马基雅维利 1513 年的手册，浓缩为四个思想：以技艺顶住命运的洪水，让人畏惧而不招恨，显得德行兼备，同时保持武装。</video:description>
<video:player_loc>https://aivoken.com/films/prince/zh/index.html</video:player_loc>
<video:duration>28</video:duration>
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<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<video:thumbnail_loc>https://aivoken.com/samples/prince.jpg</video:thumbnail_loc>
<video:description>El manual de 1513 de Maquiavelo en cuatro ideas: conservar el poder con habilidad frente a las crecidas de la fortuna, ser temido sin ser odiado y parecer virtuoso permaneciendo armado.</video:description>
<video:player_loc>https://aivoken.com/films/prince/es/index.html</video:player_loc>
<video:duration>28</video:duration>
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<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<video:thumbnail_loc>https://aivoken.com/samples/prince.jpg</video:thumbnail_loc>
<video:description>1513年のマキャヴェッリの手引書を4つの考えで読む。運命の洪水を技で退け、憎まれずに恐れられ、武装したまま徳ある姿を見せること。</video:description>
<video:player_loc>https://aivoken.com/films/prince/ja/index.html</video:player_loc>
<video:duration>28</video:duration>
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<video:title>Le Prince de Machiavel en quatre idées</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/prince.jpg</video:thumbnail_loc>
<video:description>Le manuel de Machiavel de 1513 en quatre idées : tenir le pouvoir par l'habileté face aux crues de la fortune, être craint sans être haï, et paraître vertueux tout en restant armé.</video:description>
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<video:video>
<video:title>Machiavellis Der Fürst in vier Ideen</video:title>
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<video:description>Machiavellis Handbuch von 1513 in vier Ideen: Macht halten durch Können gegen die Fluten des Schicksals, gefürchtet werden ohne gehasst zu werden, und tugendhaft wirken, während man bewaffnet bleibt.</video:description>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/machiavellis-the-prince" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/machiavellis-the-prince" />
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<video:video>
<video:title>O Príncipe de Maquiavel em quatro ideias</video:title>
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<video:description>O manual de 1513 de Maquiavel em quatro ideias: segurar o poder com técnica contra as cheias da fortuna, ser temido sem ser odiado e parecer virtuoso permanecendo armado.</video:description>
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<video:duration>28</video:duration>
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<url>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/platos-cave" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/platos-cave" />
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<video:video>
<video:title>Plato's cave allegory, explained</video:title>
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<video:description>Plato's cave: chained prisoners mistake shadows for the world. One climbs to the sunlight, then returns to people who cannot believe him.</video:description>
<video:player_loc>https://aivoken.com/films/cave/index.html</video:player_loc>
<video:duration>28</video:duration>
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<lastmod>2026-10-27T00:00:00.000Z</lastmod>
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<url>
<loc>https://aivoken.com/zh/learn/history/platos-cave</loc>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/platos-cave" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/platos-cave" />
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<video:video>
<video:title>柏拉图的洞穴寓言，一次讲透</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/cave.jpg</video:thumbnail_loc>
<video:description>柏拉图的洞穴：被锁住的囚徒把影子当成全世界。一个人爬向阳光，回来后却没人相信他。</video:description>
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<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/platos-cave" />
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<video:video>
<video:title>La alegoría de la caverna de Platón, explicada</video:title>
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<video:description>La caverna de Platón: unos prisioneros encadenados confunden las sombras con el mundo. Uno sube a la luz del sol y regresa con gente que no puede creerle.</video:description>
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<video:video>
<video:title>プラトン「洞窟の比喩」を解説</video:title>
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<video:description>プラトンの洞窟。鎖につながれた囚人たちは影を世界と思い込む。ひとりが日光へ登り、それから、信じない人々のもとへ戻る。</video:description>
<video:player_loc>https://aivoken.com/films/cave/ja/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
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<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/history/platos-cave" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/platos-cave" />
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<video:video>
<video:title>L'allégorie de la caverne de Platon, expliquée</video:title>
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<video:description>La caverne de Platon : des prisonniers enchaînés prennent les ombres pour le monde. L'un d'eux gravit jusqu'à la lumière, puis revient vers des gens qui ne peuvent pas le croire.</video:description>
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<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<url>
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<video:video>
<video:title>Platons Höhlengleichnis, erklärt</video:title>
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<video:description>Platons Höhlengleichnis: gekettete Gefangene verwechseln Schatten mit der Welt. Einer steigt ins Sonnenlicht, dann kehrt er zurück zu Menschen, die ihm nicht glauben können.</video:description>
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<video:duration>28</video:duration>
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<url>
<loc>https://aivoken.com/pt/learn/history/platos-cave</loc>
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<video:video>
<video:title>A alegoria da caverna de Platão, explicada</video:title>
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<video:description>A caverna de Platão: prisioneiros acorrentados confundem sombras com o mundo. Um deles escala até a luz do sol e volta para pessoas que não acreditam nele.</video:description>
<video:player_loc>https://aivoken.com/films/cave/pt/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<url>
<loc>https://aivoken.com/learn/money/adam-smiths-invisible-hand</loc>
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<video:video>
<video:title>Adam Smith's invisible hand, explained</video:title>
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<video:description>Adam Smith's pin factory, the self-interest of the butcher and baker, and the invisible hand that turns private gain into public plenty.</video:description>
<video:player_loc>https://aivoken.com/films/smith/index.html</video:player_loc>
<video:duration>28</video:duration>
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<url>
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<video:video>
<video:title>亚当·斯密的“看不见的手”，一文讲透</video:title>
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<video:description>亚当·斯密的制针工厂、肉商与面包师的自利，以及把私人收益变成公共富足的那只“看不见的手”。</video:description>
<video:player_loc>https://aivoken.com/films/smith/zh/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<url>
<loc>https://aivoken.com/es/learn/money/adam-smiths-invisible-hand</loc>
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<video:video>
<video:title>La mano invisible de Adam Smith, explicada</video:title>
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<video:description>La fábrica de alfileres de Adam Smith, el interés propio del carnicero y del panadero, y la mano invisible que convierte la ganancia privada en abundancia pública.</video:description>
<video:player_loc>https://aivoken.com/films/smith/es/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<loc>https://aivoken.com/ja/learn/money/adam-smiths-invisible-hand</loc>
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<video:video>
<video:title>アダム・スミスの「見えざる手」とは</video:title>
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<video:player_loc>https://aivoken.com/films/smith/ja/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<video:description>L'atelier d'épingles d'Adam Smith, l'intérêt personnel du boucher et du boulanger, et la main invisible qui change le gain privé en abondance publique.</video:description>
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<video:duration>28</video:duration>
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<video:thumbnail_loc>https://aivoken.com/samples/smith.jpg</video:thumbnail_loc>
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<video:thumbnail_loc>https://aivoken.com/samples/darwin.jpg</video:thumbnail_loc>
<video:description>自然選択は4つの段階で動く。変異は遺伝し、生まれる数は生き残る数を上回る。最も適したものがふるいを通り、深い時間が生命の樹を描く。</video:description>
<video:player_loc>https://aivoken.com/films/darwin/ja/index.html</video:player_loc>
<video:duration>120</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/fr/learn/science/how-natural-selection-works</loc>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/how-natural-selection-works" />
<video:video>
<video:title>Comment fonctionne la sélection naturelle</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/darwin.jpg</video:thumbnail_loc>
<video:description>La sélection naturelle en quatre étapes : la variation est héritée, plus d'individus naissent qu'il n'en survit, les plus aptes passent le filtre, et le temps profond dessine l'arbre de la vie.</video:description>
<video:player_loc>https://aivoken.com/films/darwin/fr/index.html</video:player_loc>
<video:duration>120</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/de/learn/science/how-natural-selection-works</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/how-natural-selection-works" />
<video:video>
<video:title>Wie natürliche Selektion funktioniert</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/darwin.jpg</video:thumbnail_loc>
<video:description>Natürliche Selektion in vier Schritten: Variation wird vererbt, mehr werden geboren als überleben, die Tüchtigsten passieren den Filter – und die tiefe Zeit zeichnet den Baum des Lebens.</video:description>
<video:player_loc>https://aivoken.com/films/darwin/de/index.html</video:player_loc>
<video:duration>120</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/pt/learn/science/how-natural-selection-works</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/science/how-natural-selection-works" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/how-natural-selection-works" />
<video:video>
<video:title>Como funciona a seleção natural</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/darwin.jpg</video:thumbnail_loc>
<video:description>A seleção natural em quatro passos: a variação é herdada, nascem mais do que sobrevivem, os mais aptos passam pelo filtro, e o tempo profundo desenha a árvore da vida.</video:description>
<video:player_loc>https://aivoken.com/films/darwin/pt/index.html</video:player_loc>
<video:duration>120</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/learn/history/orwells-1984</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/history/orwells-1984" />
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<video:video>
<video:title>Orwell's 1984 in four ideas</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/orwell.jpg</video:thumbnail_loc>
<video:description>Orwell's 1984 in four ideas: telescreens and Big Brother, doublethink, Newspeak shrinking the language, and a Party that seeks power for its own sake.</video:description>
<video:player_loc>https://aivoken.com/films/orwell/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<url>
<loc>https://aivoken.com/zh/learn/history/orwells-1984</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/history/orwells-1984" />
<video:video>
<video:title>奥威尔《1984》的四个核心思想</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/orwell.jpg</video:thumbnail_loc>
<video:description>奥威尔《1984》的四个核心思想：电幕与老大哥、双重思想、让语言不断缩水的新话，以及一个为权力本身而追逐权力的党。</video:description>
<video:player_loc>https://aivoken.com/films/orwell/zh/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<url>
<loc>https://aivoken.com/es/learn/history/orwells-1984</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/history/orwells-1984" />
<video:video>
<video:title>1984 de Orwell en cuatro ideas</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/orwell.jpg</video:thumbnail_loc>
<video:description>1984 de Orwell en cuatro ideas: telepantallas y el Hermano Grande, el doblepensar, la neolengua que encoge el idioma y un Partido que busca el poder por sí mismo.</video:description>
<video:player_loc>https://aivoken.com/films/orwell/es/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/ja/learn/history/orwells-1984</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/history/orwells-1984" />
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<video:video>
<video:title>オーウェル『1984年』の4つの考え</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/orwell.jpg</video:thumbnail_loc>
<video:description>『1984年』を4つの考えで読む。テレスクリーンとビッグブラザー、二重思考、言葉を削り取るニュースピーク、そして権力そのものを目的とする党。</video:description>
<video:player_loc>https://aivoken.com/films/orwell/ja/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/fr/learn/history/orwells-1984</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/history/orwells-1984" />
<video:video>
<video:title>1984 d'Orwell en quatre idées</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/orwell.jpg</video:thumbnail_loc>
<video:description>1984 d'Orwell en quatre idées : les télécrans et le Big Brother, la doublepensée, le novlangue qui rétrécit la langue, et un Parti qui cherche le pouvoir pour le pouvoir.</video:description>
<video:player_loc>https://aivoken.com/films/orwell/fr/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/de/learn/history/orwells-1984</loc>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/orwells-1984" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/orwells-1984" />
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<video:video>
<video:title>Orwells 1984 in vier Ideen</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/orwell.jpg</video:thumbnail_loc>
<video:description>Orwells 1984 in vier Ideen: Teleschirme und Großer Bruder, Doppeldenk, Neusprech, das die Sprache beschneidet, und eine Partei, die Macht um der Macht willen will.</video:description>
<video:player_loc>https://aivoken.com/films/orwell/de/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/pt/learn/history/orwells-1984</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/history/orwells-1984" />
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<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/orwells-1984" />
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<video:video>
<video:title>1984 de Orwell em quatro ideias</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/orwell.jpg</video:thumbnail_loc>
<video:description>1984 de Orwell em quatro ideias: teletelas e o Grande Irmão, o duplipensar, a novilíngua encolhendo o idioma e um Partido que busca o poder pelo próprio poder.</video:description>
<video:player_loc>https://aivoken.com/films/orwell/pt/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/learn/history/thoreaus-walden</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/history/thoreaus-walden" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/thoreaus-walden" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/thoreaus-walden" />
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<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/history/thoreaus-walden" />
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<video:video>
<video:title>Thoreau's Walden in four ideas</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/walden.jpg</video:thumbnail_loc>
<video:description>Thoreau's Walden in four ideas: a $28 cabin by the pond, the four necessities, the real cost of a thing measured in life, and the lake as earth's eye.</video:description>
<video:player_loc>https://aivoken.com/films/walden/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<url>
<loc>https://aivoken.com/zh/learn/history/thoreaus-walden</loc>
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<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/thoreaus-walden" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/history/thoreaus-walden" />
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<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/history/thoreaus-walden" />
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<video:video>
<video:title>四个观念，读懂梭罗《瓦尔登湖》</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/walden.jpg</video:thumbnail_loc>
<video:description>四个观念走进梭罗的《瓦尔登湖》：湖畔一座 $28 的小屋、四项生活必需品、以生命丈量的真实成本，以及作为大地之眼的湖泊。</video:description>
<video:player_loc>https://aivoken.com/films/walden/zh/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/es/learn/history/thoreaus-walden</loc>
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<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/thoreaus-walden" />
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<video:video>
<video:title>El Walden de Thoreau en cuatro ideas</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/walden.jpg</video:thumbnail_loc>
<video:description>El Walden de Thoreau en cuatro ideas: una cabaña de $28 junto al estanque, las cuatro necesidades, el costo real de una cosa medido en vida y el lago como ojo de la tierra.</video:description>
<video:player_loc>https://aivoken.com/films/walden/es/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<url>
<loc>https://aivoken.com/ja/learn/history/thoreaus-walden</loc>
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<video:video>
<video:title>ソロー『ウォールデン』の4つの考え</video:title>
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<video:description>ソロー『ウォールデン』の4つの考え：池のほとりの$28の小屋、4つの必需品、人生で測る物の本当の値段、そして「大地の目」としての湖。</video:description>
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<video:duration>28</video:duration>
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<video:video>
<video:title>Le Walden de Thoreau en quatre idées</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/walden.jpg</video:thumbnail_loc>
<video:description>Le Walden de Thoreau en quatre idées : un cabanon à 28 $ au bord de l'étang, les quatre nécessités, le vrai coût d'une chose mesuré en vie, et le lac comme œil de la terre.</video:description>
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<video:duration>28</video:duration>
</video:video>
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<video:video>
<video:title>Thoreaus Walden in vier Ideen</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/walden.jpg</video:thumbnail_loc>
<video:description>Thoreaus Walden in vier Ideen: eine Hütte für 28 $ am See, die vier Notwendigkeiten, der wahre Preis einer Sache – gemessen in Lebenszeit – und der See als Auge der Erde.</video:description>
<video:player_loc>https://aivoken.com/films/walden/de/index.html</video:player_loc>
<video:duration>28</video:duration>
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<lastmod>2026-10-27T00:00:00.000Z</lastmod>
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<video:video>
<video:title>O Walden de Thoreau em quatro ideias</video:title>
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<video:description>O Walden de Thoreau em quatro ideias: uma cabana de $28 à beira do lago, as quatro necessidades, o custo real de uma coisa medido em vida e o lago como olho da terra.</video:description>
<video:player_loc>https://aivoken.com/films/walden/pt/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-27T00:00:00.000Z</lastmod>
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<video:thumbnail_loc>https://aivoken.com/samples/neural.jpg</video:thumbnail_loc>
<video:description>A neural network learns by guessing, measuring its mistake and nudging its connection weights, over and over, until its answers come out right.</video:description>
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<video:duration>28</video:duration>
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<video:thumbnail_loc>https://aivoken.com/samples/neural.jpg</video:thumbnail_loc>
<video:description>神经网络是这样学习的：先猜，再量出误差，然后微调连接权重，一遍又一遍，直到答案变对。</video:description>
<video:player_loc>https://aivoken.com/films/neural/zh/index.html</video:player_loc>
<video:duration>28</video:duration>
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<video:description>Una red neuronal aprende adivinando, midiendo su error y ajustando poco a poco los pesos de sus conexiones, una y otra vez, hasta que sus respuestas salen bien.</video:description>
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<video:duration>28</video:duration>
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<video:video>
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<video:thumbnail_loc>https://aivoken.com/samples/neural.jpg</video:thumbnail_loc>
<video:description>ニューラルネットワークは、推測し、誤りを測り、接続の重みを少しずつ動かすことを繰り返して、正しい答えに近づいていく。</video:description>
<video:player_loc>https://aivoken.com/films/neural/ja/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-25T00:00:00.000Z</lastmod>
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<video:video>
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<video:thumbnail_loc>https://aivoken.com/samples/neural.jpg</video:thumbnail_loc>
<video:description>Un réseau de neurones apprend en devinant, en mesurant son erreur et en ajustant un peu ses poids de connexion, encore et encore, jusqu'à ce que ses réponses deviennent justes.</video:description>
<video:player_loc>https://aivoken.com/films/neural/fr/index.html</video:player_loc>
<video:duration>28</video:duration>
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<lastmod>2026-10-25T00:00:00.000Z</lastmod>
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<video:video>
<video:title>Wie ein neuronales Netz lernt</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/neural.jpg</video:thumbnail_loc>
<video:description>Ein neuronales Netz lernt, indem es rät, seinen Fehler misst und seine Verbindungsgewichte ein wenig nachjustiert – immer wieder, bis die Antworten stimmen.</video:description>
<video:player_loc>https://aivoken.com/films/neural/de/index.html</video:player_loc>
<video:duration>28</video:duration>
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<video:thumbnail_loc>https://aivoken.com/samples/neural.jpg</video:thumbnail_loc>
<video:description>Uma rede neural aprende chutando, medindo o erro e ajustando um pouco os pesos das conexões, vezes e vezes, até as respostas saírem certas.</video:description>
<video:player_loc>https://aivoken.com/films/neural/pt/index.html</video:player_loc>
<video:duration>28</video:duration>
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<lastmod>2026-10-25T00:00:00.000Z</lastmod>
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<video:video>
<video:title>Why moving clocks run slow</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/relativity.jpg</video:thumbnail_loc>
<video:description>Special relativity in four steps: light’s fixed speed and a clock made of light show why a moving clock ticks more slowly.</video:description>
<video:player_loc>https://aivoken.com/films/relativity/index.html</video:player_loc>
<video:duration>28</video:duration>
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<video:player_loc>https://aivoken.com/films/relativity/zh/index.html</video:player_loc>
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<video:description>La relatividad especial en cuatro pasos: la velocidad fija de la luz y un reloj hecho de luz muestran por qué un reloj en movimiento corre más despacio.</video:description>
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<video:duration>28</video:duration>
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<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/body/how-vaccines-train-your-immune-system" />
<video:video>
<video:title>Cómo las vacunas entrenan a tu sistema inmunitario</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/vaccine.jpg</video:thumbnail_loc>
<video:description>Una vacuna permite que tu sistema inmunitario conozca una copia inofensiva de un germen, aprenda su forma y la recuerde, de modo que el germen real se encuentre con una respuesta rápida.</video:description>
<video:player_loc>https://aivoken.com/films/vaccine/es/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-25T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<url>
<loc>https://aivoken.com/ja/learn/body/how-vaccines-train-your-immune-system</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/body/how-vaccines-train-your-immune-system" />
<video:video>
<video:title>ワクチンが免疫系を鍛えるしくみ</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/vaccine.jpg</video:thumbnail_loc>
<video:description>ワクチンは免疫系に、病原体の無害な複製と出会わせる。その形を学び、記憶する。だから本物の病原体には、速い反応が待っている。</video:description>
<video:player_loc>https://aivoken.com/films/vaccine/ja/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-25T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/fr/learn/body/how-vaccines-train-your-immune-system</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/body/how-vaccines-train-your-immune-system" />
<video:video>
<video:title>Comment les vaccins entraînent votre système immunitaire</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/vaccine.jpg</video:thumbnail_loc>
<video:description>Un vaccin laisse votre système immunitaire rencontrer une copie inoffensive d'un germe, apprendre sa forme et la mémoriser, pour que le vrai germe rencontre une réponse rapide.</video:description>
<video:player_loc>https://aivoken.com/films/vaccine/fr/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-25T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<loc>https://aivoken.com/de/learn/body/how-vaccines-train-your-immune-system</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/body/how-vaccines-train-your-immune-system" />
<video:video>
<video:title>Wie Impfungen dein Immunsystem trainieren</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/vaccine.jpg</video:thumbnail_loc>
<video:description>Eine Impfung lässt dein Immunsystem eine harmlose Kopie eines Erregers kennenlernen, seine Form lernen und sich merken – dem echten Erreger steht dann eine schnelle Abwehr bereit.</video:description>
<video:player_loc>https://aivoken.com/films/vaccine/de/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-25T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<loc>https://aivoken.com/pt/learn/body/how-vaccines-train-your-immune-system</loc>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/body/how-vaccines-train-your-immune-system" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/body/how-vaccines-train-your-immune-system" />
<video:video>
<video:title>Como as vacinas treinam seu sistema imunológico</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/vaccine.jpg</video:thumbnail_loc>
<video:description>Uma vacina deixa seu sistema imunológico conhecer uma cópia inofensiva de um germe, aprender a forma dela e lembrar dela, para que o germe de verdade encontre uma resposta rápida.</video:description>
<video:player_loc>https://aivoken.com/films/vaccine/pt/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-25T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<loc>https://aivoken.com/learn/science/why-the-moon-has-phases</loc>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/why-the-moon-has-phases" />
<video:video>
<video:title>Why the Moon has phases</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/moon.jpg</video:thumbnail_loc>
<video:description>Half the Moon is always lit by the Sun. Its phases come from the angle we see that half from, not from Earth’s shadow.</video:description>
<video:player_loc>https://aivoken.com/films/moon/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-25T00:00:00.000Z</lastmod>
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<loc>https://aivoken.com/zh/learn/science/why-the-moon-has-phases</loc>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/why-the-moon-has-phases" />
<video:video>
<video:title>月亮为什么有圆缺</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/moon.jpg</video:thumbnail_loc>
<video:description>月亮永远有一半被太阳照亮。月相来自我们观看这半个月亮的角度，而不是地球的影子。</video:description>
<video:player_loc>https://aivoken.com/films/moon/zh/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-25T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<loc>https://aivoken.com/es/learn/science/why-the-moon-has-phases</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/why-the-moon-has-phases" />
<video:video>
<video:title>Por qué la Luna tiene fases</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/moon.jpg</video:thumbnail_loc>
<video:description>La mitad de la Luna está siempre iluminada por el Sol. Sus fases vienen del ángulo desde el que vemos esa mitad, no de la sombra de la Tierra.</video:description>
<video:player_loc>https://aivoken.com/films/moon/es/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-25T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/ja/learn/science/why-the-moon-has-phases</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/why-the-moon-has-phases" />
<video:video>
<video:title>月が満ち欠けする理由</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/moon.jpg</video:thumbnail_loc>
<video:description>月は常に半分が太陽に照らされている。満ち欠けは、その明るい半分を私たちがどの角度から見るかによるもので、地球の影ではない。</video:description>
<video:player_loc>https://aivoken.com/films/moon/ja/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-25T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<loc>https://aivoken.com/fr/learn/science/why-the-moon-has-phases</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/why-the-moon-has-phases" />
<video:video>
<video:title>Pourquoi la Lune a des phases</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/moon.jpg</video:thumbnail_loc>
<video:description>La moitié de la Lune est toujours éclairée par le Soleil. Ses phases viennent de l'angle sous lequel nous voyons cette moitié, pas de l'ombre de la Terre.</video:description>
<video:player_loc>https://aivoken.com/films/moon/fr/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-25T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<loc>https://aivoken.com/de/learn/science/why-the-moon-has-phases</loc>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/why-the-moon-has-phases" />
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<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/why-the-moon-has-phases" />
<video:video>
<video:title>Warum der Mond Phasen hat</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/moon.jpg</video:thumbnail_loc>
<video:description>Die Hälfte des Mondes wird immer von der Sonne angeleuchtet. Seine Phasen kommen vom Winkel, aus dem wir diese Hälfte sehen – nicht vom Erdschatten.</video:description>
<video:player_loc>https://aivoken.com/films/moon/de/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-25T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/pt/learn/science/why-the-moon-has-phases</loc>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/why-the-moon-has-phases" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/why-the-moon-has-phases" />
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<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/why-the-moon-has-phases" />
<video:video>
<video:title>Por que a Lua tem fases</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/moon.jpg</video:thumbnail_loc>
<video:description>Metade da Lua está sempre iluminada pelo Sol. Suas fases vêm do ângulo do qual vemos essa metade, não da sombra da Terra.</video:description>
<video:player_loc>https://aivoken.com/films/moon/pt/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-25T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
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<loc>https://aivoken.com/learn/science/where-rain-comes-from</loc>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/where-rain-comes-from" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/where-rain-comes-from" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/where-rain-comes-from" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/where-rain-comes-from" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/where-rain-comes-from" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/science/where-rain-comes-from" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/where-rain-comes-from" />
<video:video>
<video:title>Where rain comes from</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/rain.jpg</video:thumbnail_loc>
<video:description>Evaporation, condensation, rain and rivers: how the same water travels from the sea to the clouds and back again.</video:description>
<video:player_loc>https://aivoken.com/films/rain/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-25T00:00:00.000Z</lastmod>
<priority>0.8</priority>
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<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/where-rain-comes-from" />
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<video:duration>28</video:duration>
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<lastmod>2026-10-25T00:00:00.000Z</lastmod>
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<video:duration>28</video:duration>
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<lastmod>2026-10-25T00:00:00.000Z</lastmod>
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<video:duration>28</video:duration>
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<lastmod>2026-10-25T00:00:00.000Z</lastmod>
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<video:duration>28</video:duration>
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<lastmod>2026-10-25T00:00:00.000Z</lastmod>
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<video:player_loc>https://aivoken.com/films/press/zh/index.html</video:player_loc>
<video:duration>28</video:duration>
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<video:duration>28</video:duration>
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<video:duration>28</video:duration>
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<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/money/how-compound-interest-grows" />
<video:video>
<video:title>复利是怎么滚起来的</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/keynote.jpg</video:thumbnail_loc>
<video:description>为什么 $1,000 按 7% 的年利率 30 年后约变成 $7,612，而单利只能到 $3,100。</video:description>
<video:player_loc>https://aivoken.com/films/keynote/zh/index.html</video:player_loc>
<video:duration>27</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/es/learn/money/how-compound-interest-grows</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/money/how-compound-interest-grows" />
<video:video>
<video:title>Cómo crece el interés compuesto</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/keynote.jpg</video:thumbnail_loc>
<video:description>Por qué $1,000 al 7% se convierten en unos $7,612 en 30 años, y por qué el interés simple solo llega a $3,100.</video:description>
<video:player_loc>https://aivoken.com/films/keynote/es/index.html</video:player_loc>
<video:duration>27</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/ja/learn/money/how-compound-interest-grows</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/money/how-compound-interest-grows" />
<video:video>
<video:title>複利はどう膨らむか</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/keynote.jpg</video:thumbnail_loc>
<video:description>$1,000を年7%で運用すると30年で約$7,612になる理由。単利では$3,100にとどまる。</video:description>
<video:player_loc>https://aivoken.com/films/keynote/ja/index.html</video:player_loc>
<video:duration>27</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/fr/learn/money/how-compound-interest-grows</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/money/how-compound-interest-grows" />
<video:video>
<video:title>Comment croissent les intérêts composés</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/keynote.jpg</video:thumbnail_loc>
<video:description>Pourquoi 1 000 $ à 7% deviennent environ 7 612 $ en 30 ans, et pourquoi l'intérêt simple n'atteint que 3 100 $.</video:description>
<video:player_loc>https://aivoken.com/films/keynote/fr/index.html</video:player_loc>
<video:duration>27</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/de/learn/money/how-compound-interest-grows</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/money/how-compound-interest-grows" />
<video:video>
<video:title>Wie Zinseszins wächst</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/keynote.jpg</video:thumbnail_loc>
<video:description>Warum aus 1.000 $ zu 7% nach 30 Jahren etwa 7.612 $ werden – und warum einfacher Zins nur auf 3.100 $ kommt.</video:description>
<video:player_loc>https://aivoken.com/films/keynote/de/index.html</video:player_loc>
<video:duration>27</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/pt/learn/money/how-compound-interest-grows</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/money/how-compound-interest-grows" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/money/how-compound-interest-grows" />
<video:video>
<video:title>Como os juros compostos crescem</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/keynote.jpg</video:thumbnail_loc>
<video:description>Por que $1,000 a 7% vira cerca de $7,612 em 30 anos, e por que o juro simples só chega a $3,100.</video:description>
<video:player_loc>https://aivoken.com/films/keynote/pt/index.html</video:player_loc>
<video:duration>27</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/learn/science/why-is-the-sky-blue</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/why-is-the-sky-blue" />
<video:video>
<video:title>Why is the sky blue?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/whiteboard.jpg</video:thumbnail_loc>
<video:description>Sunlight holds every colour, but air scatters short blue waves far more than long red ones. That is also why sunsets turn red.</video:description>
<video:player_loc>https://aivoken.com/films/whiteboard/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/zh/learn/science/why-is-the-sky-blue</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/why-is-the-sky-blue" />
<video:video>
<video:title>天空为什么是蓝色的？</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/whiteboard.jpg</video:thumbnail_loc>
<video:description>阳光包含所有颜色，但空气对短波蓝光的散射远强于长波红光。夕阳变红，也是同一个原因。</video:description>
<video:player_loc>https://aivoken.com/films/whiteboard/zh/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/es/learn/science/why-is-the-sky-blue</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/why-is-the-sky-blue" />
<video:video>
<video:title>¿Por qué el cielo es azul?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/whiteboard.jpg</video:thumbnail_loc>
<video:description>La luz del sol contiene todos los colores, pero el aire dispersa las ondas azules y cortas mucho más que las rojas y largas. Por eso también los atardeceres se vuelven rojos.</video:description>
<video:player_loc>https://aivoken.com/films/whiteboard/es/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/ja/learn/science/why-is-the-sky-blue</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/why-is-the-sky-blue" />
<video:video>
<video:title>なぜ空は青いのか</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/whiteboard.jpg</video:thumbnail_loc>
<video:description>太陽光はあらゆる色を含むが、空気は短い青い波を、長い赤い波よりはるかに強く散乱させる。日没が赤くなるのも同じ理由である。</video:description>
<video:player_loc>https://aivoken.com/films/whiteboard/ja/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/fr/learn/science/why-is-the-sky-blue</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/why-is-the-sky-blue" />
<video:video>
<video:title>Pourquoi le ciel est-il bleu ?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/whiteboard.jpg</video:thumbnail_loc>
<video:description>La lumière du Soleil contient toutes les couleurs, mais l'air disperse beaucoup plus les courtes ondes bleues que les longues ondes rouges. C'est aussi pourquoi les couchers de soleil virent au rouge.</video:description>
<video:player_loc>https://aivoken.com/films/whiteboard/fr/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/de/learn/science/why-is-the-sky-blue</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/why-is-the-sky-blue" />
<video:video>
<video:title>Warum ist der Himmel blau?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/whiteboard.jpg</video:thumbnail_loc>
<video:description>Sonnenlicht enthält jede Farbe, aber Luft streut kurze blaue Wellen viel stärker als lange rote. Deshalb werden Sonnenuntergänge auch rot.</video:description>
<video:player_loc>https://aivoken.com/films/whiteboard/de/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/pt/learn/science/why-is-the-sky-blue</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/science/why-is-the-sky-blue" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/science/why-is-the-sky-blue" />
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<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/science/why-is-the-sky-blue" />
<video:video>
<video:title>Por que o céu é azul?</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/whiteboard.jpg</video:thumbnail_loc>
<video:description>A luz do Sol tem todas as cores, mas o ar espalha muito mais as ondas azuis curtas que as vermelhas longas. É também por isso que os poentes ficam vermelhos.</video:description>
<video:player_loc>https://aivoken.com/films/whiteboard/pt/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/learn/how-things-work/the-law-of-the-lever</loc>
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<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/how-things-work/the-law-of-the-lever" />
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<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/how-things-work/the-law-of-the-lever" />
<video:video>
<video:title>The law of the lever</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/blueprint.jpg</video:thumbnail_loc>
<video:description>How 100 N can lift a 400 N load, and why a lever trades force for distance instead of creating energy.</video:description>
<video:player_loc>https://aivoken.com/films/blueprint/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/zh/learn/how-things-work/the-law-of-the-lever</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/how-things-work/the-law-of-the-lever" />
<video:video>
<video:title>杠杆定律</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/blueprint.jpg</video:thumbnail_loc>
<video:description>100 N 的力如何抬起 400 N 的重物，以及杠杆为什么是在用力换距离，而不是凭空产生能量。</video:description>
<video:player_loc>https://aivoken.com/films/blueprint/zh/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/es/learn/how-things-work/the-law-of-the-lever</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/how-things-work/the-law-of-the-lever" />
<video:video>
<video:title>La ley de la palanca</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/blueprint.jpg</video:thumbnail_loc>
<video:description>Cómo 100 N pueden levantar una carga de 400 N, y por qué una palanca cambia fuerza por distancia en lugar de crear energía.</video:description>
<video:player_loc>https://aivoken.com/films/blueprint/es/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/ja/learn/how-things-work/the-law-of-the-lever</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/how-things-work/the-law-of-the-lever" />
<video:video>
<video:title>テコの法則</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/blueprint.jpg</video:thumbnail_loc>
<video:description>100 Nで400 Nの荷を持ち上げるしくみと、テコがエネルギーを生まずに力を距離と交換する理由。</video:description>
<video:player_loc>https://aivoken.com/films/blueprint/ja/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/fr/learn/how-things-work/the-law-of-the-lever</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/how-things-work/the-law-of-the-lever" />
<video:video>
<video:title>La loi du levier</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/blueprint.jpg</video:thumbnail_loc>
<video:description>Comment 100 N peuvent soulever une charge de 400 N, et pourquoi le levier échange la force contre la distance au lieu de créer de l'énergie.</video:description>
<video:player_loc>https://aivoken.com/films/blueprint/fr/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/de/learn/how-things-work/the-law-of-the-lever</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/how-things-work/the-law-of-the-lever" />
<video:video>
<video:title>Das Hebelgesetz</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/blueprint.jpg</video:thumbnail_loc>
<video:description>Wie 100 N ein Gewicht von 400 N heben können und warum ein Hebel Kraft gegen Strecke tauscht, statt Energie zu erzeugen.</video:description>
<video:player_loc>https://aivoken.com/films/blueprint/de/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/pt/learn/how-things-work/the-law-of-the-lever</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/how-things-work/the-law-of-the-lever" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/how-things-work/the-law-of-the-lever" />
<video:video>
<video:title>A lei da alavanca</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/blueprint.jpg</video:thumbnail_loc>
<video:description>Como 100 N podem levantar uma carga de 400 N, e por que a alavanca troca força por distância em vez de criar energia.</video:description>
<video:player_loc>https://aivoken.com/films/blueprint/pt/index.html</video:player_loc>
<video:duration>28</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/learn/history/leonardos-aerial-screw</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/history/leonardos-aerial-screw" />
<video:video>
<video:title>Leonardo’s aerial screw</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/davinci.jpg</video:thumbnail_loc>
<video:description>Leonardo da Vinci’s 1480s design for a machine that would screw itself into the air, and why it could never fly.</video:description>
<video:player_loc>https://aivoken.com/films/davinci/index.html</video:player_loc>
<video:duration>26</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/zh/learn/history/leonardos-aerial-screw</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/history/leonardos-aerial-screw" />
<video:video>
<video:title>达·芬奇的空中螺旋</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/davinci.jpg</video:thumbnail_loc>
<video:description>达·芬奇 1480 年代的设计：一台想把自己旋进天空的机器——以及它为什么永远飞不起来。</video:description>
<video:player_loc>https://aivoken.com/films/davinci/zh/index.html</video:player_loc>
<video:duration>26</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/es/learn/history/leonardos-aerial-screw</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/history/leonardos-aerial-screw" />
<video:video>
<video:title>El tornillo aéreo de Leonardo</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/davinci.jpg</video:thumbnail_loc>
<video:description>El diseño de Leonardo da Vinci de los años 1480 para una máquina que se enroscaría en el aire, y por qué nunca pudo volar.</video:description>
<video:player_loc>https://aivoken.com/films/davinci/es/index.html</video:player_loc>
<video:duration>26</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/ja/learn/history/leonardos-aerial-screw</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/history/leonardos-aerial-screw" />
<video:video>
<video:title>レオナルドの空中螺旋</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/davinci.jpg</video:thumbnail_loc>
<video:description>レオナルド・ダ・ヴィンチが1480年代に構想した、空へねじ込んで昇る機械と、それが決して飛べなかった理由。</video:description>
<video:player_loc>https://aivoken.com/films/davinci/ja/index.html</video:player_loc>
<video:duration>26</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/fr/learn/history/leonardos-aerial-screw</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/history/leonardos-aerial-screw" />
<video:video>
<video:title>La vis aérienne de Léonard</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/davinci.jpg</video:thumbnail_loc>
<video:description>Le projet de Léonard de Vinci des années 1480 pour une machine qui se vissait dans le ciel — et pourquoi elle n'a jamais pu voler.</video:description>
<video:player_loc>https://aivoken.com/films/davinci/fr/index.html</video:player_loc>
<video:duration>26</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/de/learn/history/leonardos-aerial-screw</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/history/leonardos-aerial-screw" />
<video:video>
<video:title>Leonardos Luftschraube</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/davinci.jpg</video:thumbnail_loc>
<video:description>Leonardo da Vincis Entwurf aus den 1480er-Jahren für eine Maschine, die sich in die Luft schrauben sollte – und warum sie nie fliegen konnte.</video:description>
<video:player_loc>https://aivoken.com/films/davinci/de/index.html</video:player_loc>
<video:duration>26</video:duration>
</video:video>
<lastmod>2026-10-24T00:00:00.000Z</lastmod>
<priority>0.8</priority>
</url>
<url>
<loc>https://aivoken.com/pt/learn/history/leonardos-aerial-screw</loc>
<xhtml:link rel="alternate" hreflang="x-default" href="https://aivoken.com/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="en" href="https://aivoken.com/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="zh-CN" href="https://aivoken.com/zh/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="es" href="https://aivoken.com/es/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="ja" href="https://aivoken.com/ja/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="fr" href="https://aivoken.com/fr/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="de" href="https://aivoken.com/de/learn/history/leonardos-aerial-screw" />
<xhtml:link rel="alternate" hreflang="pt-BR" href="https://aivoken.com/pt/learn/history/leonardos-aerial-screw" />
<video:video>
<video:title>O parafuso aéreo de Leonardo</video:title>
<video:thumbnail_loc>https://aivoken.com/samples/davinci.jpg</video:thumbnail_loc>
<video:description>O projeto de Leonardo da Vinci dos anos 1480 para uma máquina que se parafusaria no ar — e por que nunca poderia voar.</video:description>
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<video:duration>26</video:duration>
</video:video>
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