The human body contains over a billion miles of DNA.
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The adult human brain weighs about 3 pounds (1,300-1,400 g).
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It takes about 20 seconds for a red blood cell to circle the whole body.
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One human hair can support 3 ounces.
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You can't tickle yourself.
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Unconsciousness will occur after 8-10 seconds after loss of blood supply to the brain.
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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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