The Big Book
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Newest wonders
Why is the sky blue?
Sunlight is a rainbow in disguise — and the sky loves to bounce the blue part everywhere!
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Why does it rain?
Raindrops start as invisible water floating up to the sky — until the clouds get too heavy.
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Where do clouds come from?
Those fluffy clouds are made of water you can't see, gathering around specks of dust.
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What are thunder and lightning?
A flash, then a BOOM — find out how storm clouds make their own giant sparks.
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Why does it snow?
Where do those soft white flakes come from — and why does every one have six sides?
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Why do we see rainbows?
Sun plus rain makes a giant arc of colour — here's the clever trick light plays.
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