The clavicle can stretch very slightly when pulled, helping it absorb impact without breaking!
Human Body - Facts for Kids

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Random Facts About Human Body For Kids
The cells in your nails are so tightly packed that even most dyes can’t penetrate them!
Blood donation (giving blood to help others) helps save millions of lives every year around the world!
Each person has two clavicles — one on the left and one on the right — working together like a team to help your arms move properly!
The humerus is designed to absorb shock when you fall, helping protect your body from injury!