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The horizontal fraction bar was introduced by the Arabs.
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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.