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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In 1996, research found that having excessive body hair is linked to higher intelligence.
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There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
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The average sperm cell swims at 8 inches per hour.
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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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The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
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