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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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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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The horizontal fraction bar was introduced by the Arabs.
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Illicit drug use costs the United States approximately $181 billion every year.