Your bones are alive, and they grow with you as you get bigger. · KidSafe Play

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.

Bones are hard on the outside but busy on the inside. They keep growing until you are a grown-up.

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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.

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.