Your humerus (and all your bones) are alive and keep renewing themselves bit by bit — over about 10 years, many of the bone parts get replaced so your bones stay healthy and strong!
Human Body - Facts for Kids

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Random Facts About Human Body For Kids
Basic Structure and Location
The uterus is a special organ shaped like an upside-down pear that lives in the lower part of your belly, helping to create and protect growing babies!
Just like a house has layers, your nail has three main parts: the nail plate (the hard part you can see), the nail bed (the pink tissue underneath), and the matrix (where new nail cells are born)!
Basic Information
Your gallbladder’s scientific name is “Vesica biliaris” or “Cholecystis,” which comes from ancient Greek words meaning “bile sac!”