Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
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A human being loses an average of 40 to 100 strands of hair a day.
133
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
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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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In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
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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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