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Did you know?
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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There are 20 feet of blood vessels in each square inch of human skin.
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There are approximately 3 million unintended pregnancies in the United States each year.
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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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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.