Your clavicle is about as long as your index and middle fingers together!
Human Body - Facts for Kids

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Random Facts About Human Body For Kids
Your clavicle helps protect important blood vessels that supply oxygen to your arms!
Getting enough sleep helps your mitochondria rest and repair so they can make energy more efficiently — just like how you feel better and stronger after a good night’s rest!
A single drop of blood contains about 250 million red blood cells, which is more than the ~4,000 stars you can see in the darkest night sky!!
Mitochondria can join together in a process called fusion so they can mix parts and help each other work better — a bit like train cars linking up to share cargo when the cell needs extra power!