Early American humans hunted car-size armadillos and used their shells for houses.
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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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Playing Tetris after a traumatic event can prevent the development of traumatic memories and reduce the chance of having flashbacks.
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You forget 90% of your dreams.
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Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
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A human being loses an average of 40 to 100 strands of hair a day.
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Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
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