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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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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.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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There are 20 feet of blood vessels in each square inch of human skin.