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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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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It takes about 20 seconds for a red blood cell to circle the whole body.
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It would take about 1,200,000 mosquitoes to fully drain the average human body of blood.
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One human hair can support 3 ounces.
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Chewing gum boosts your brain power.
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Your heart will pump about 212 million liters in its lifetime.
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Your body is creating and killing about 2.4 million red blood cells per second.
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