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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Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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One human hair can support 3 ounces.
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Yawns are more contagious among people with closer relationships.
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It takes about 20 seconds for a red blood cell to circle the whole body.
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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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