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The human body produces and destroys 15 million blood cells every second.
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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.