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There are 20 feet of blood vessels in each square inch of human skin.
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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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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Colchicine is a highly poisonous alkaloid originally extracted from a type of saffron plant that is used mainly to treat gout.