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The horizontal fraction bar was introduced by the Arabs.
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Colchicine is a highly poisonous alkaloid originally extracted from a type of saffron plant that is used mainly to treat gout.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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.