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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 FDA recognizes 118 routes of administration.
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The human body produces and destroys 15 million blood cells every second.
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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.