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Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
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Your heart beats over 36 million times a year.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).