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The horizontal fraction bar was introduced by the Arabs.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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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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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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The average office desk has 400 times more bacteria on it than a toilet.