Why Do We Yawn, and Why Are Yawns Contagious?
The old 'we need more oxygen' answer doesn't hold up. Here is what scientists actually think about yawning, why one yawn spreads across a room, and why you might yawn just reading this.
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Why Do Cats Purr? It's Not Always Happiness
How a cat makes that rumbling sound, why kittens purr at just a few days old, and why cats sometimes purr when they're hurt or scared. The surprising science behind the purr.
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Why Is the Sky Blue? A Simple Answer for Curious Kids
Sunlight looks white, but it's really a rainbow in disguise. Here is why the air chooses blue, why sunsets turn red, and a glass-of-milk experiment that shows it on your kitchen table.
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Why Do Leaves Change Color in the Fall?
The yellow and orange were hiding inside the leaf all summer. Here is what really happens when trees turn gold and red, explained for curious kids and the grown-ups who get asked.
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