Series · 4 episodes · 2:00
Questions everyone asks
The simple questions children ask and adults rarely can answer.
Play from episode 1- 1
0:28Why is the sky blue?
Sunlight holds every colour, but air scatters short blue waves far more than long red ones. That is also why sunsets turn red.
- 2
0:28Where rain comes from
Evaporation, condensation, rain and rivers: how the same water travels from the sea to the clouds and back again.
- 3
0:28Why the Moon has phases
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.
- 4
0:36Why do we sleep?
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.