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You can’t tickle yourself.

You can’t tickle yourself.

Your brain knows your own hands are coming and cancels the ticklish surprise — so only someone else can get you.

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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. 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. Your funny bone isn't a bone at all — it's a nerve in your elbow. Your funny bone isn't a bone at all — it's a nerve in your elbow.