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Did you know?
About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
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There are 20 feet of blood vessels in each square inch of human skin.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.