The adult human brain weighs about 3 pounds (1,300-1,400 g).
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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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If your DNA was stretched out it would reach to the moon 6,000 times.
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Your thumb is about the same size as your nose.
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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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It takes about 20 seconds for a red blood cell to circle the whole body.
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Our eyes are always the same size from birth, but our nose and ears never stop growing.
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Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
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