The hard surface of your nails helps you apply pressure when pressing buttons or typing on a keyboard!
Human Body - Facts for Kids

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Random Facts About Human Body For Kids
Amazing Abilities
Your esophagus can feel hot and cold — like having a built-in thermometer inside your food tube!
Your blood vessels (tubes) grow longer as you get taller, like a growing garden hose system!
The cerebellum helps you learn from mistakes — if you miss catching a ball, it remembers and helps you do better next time!
The curve of your nail helps your fingertip maintain its shape and protects the soft tissue underneath!