An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
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It takes about 20 seconds for a red blood cell to circle the whole body.
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If your DNA was stretched out it would reach to the moon 6,000 times.
256
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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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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Poor eyesight (myopia) is associated with higher IQ.
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There are times when you're walking that the pressure on your feet exceeds your body weight, and when you're running, it can be three or four times your weight.
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