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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Lack of water is the #1 trigger of daytime fatigue.
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Fingernails grow nearly 4 times faster than toenails.
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It takes twice as long to lose new muscle if you stop working out than it did to gain it.
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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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You have no sense of smell when you're sleeping!
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A hard working adult sweats up to 4 gallons per day. Most of the sweat evaporates before a person realizes it's there, though!
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In 1996, research found that having excessive body hair is linked to higher intelligence.
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