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Your fingerprints are all your own — no one else in the world has the same ones.

Your fingerprints are all your own — no one else in the world has the same ones.

Fingerprints form before you're even born and stay the same your whole life. Even identical twins, who share the same DNA, have completely different fingerprints.

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Your heart beats about 100,000 times every day. Your heart beats about 100,000 times every day. You are a little taller in the morning than at night. You are a little taller in the morning than at night. You can’t tickle yourself. You can’t tickle yourself. Your bones are alive, and they grow with you as you get bigger. Your bones are alive, and they grow with you as you get bigger. Babies are born with about 300 bones, but grown-ups have only 206. Babies are born with about 300 bones, but grown-ups have only 206.