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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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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Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
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Your body is creating and killing about 2.4 million red blood cells per second.
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The average sperm cell swims at 8 inches per hour.
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It takes about 20 seconds for a red blood cell to circle the whole body.
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The human brain has the capacity to store everything that you experience.
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