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The horizontal fraction bar was introduced by the Arabs.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.