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Your heart beats over 36 million times a year.
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There are more bacteria in your mouth than there are people in the world.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.