Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
Your body is creating and killing about 2.4 million red blood cells per second.
17
The human brain has the capacity to store everything that you experience.
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When you take a step, you are using up to 200 muscles.
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When you get goosebumps and your hair stands, the hair helps to trap air, making you feel warmer by keeping in your body heat.
46
Your thumb is about the same size as your nose.
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Every year your body replaces 98% of your atoms.
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For most people, no matter how hard you pinch the skin on your elbow with your fingers it doesn't hurt.
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