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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.