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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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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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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.