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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Your body is creating and killing about 2.4 million red blood cells per second.
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It takes about 20 seconds for a red blood cell to circle the whole body.
102
Enamel is hardest substance in the human body.
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When you take a step, you are using up to 200 muscles.
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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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The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
The adult human brain weighs about 3 pounds (1,300-1,400 g).
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