Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
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Every year your body replaces 98% of your atoms.
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Your body is creating and killing about 2.4 million red blood cells per second.
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Your heart will pump about 212 million liters in its lifetime.
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When you take a step, you are using up to 200 muscles.
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It takes about 20 seconds for a red blood cell to circle the whole body.
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Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
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Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
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