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The horizontal fraction bar was introduced by the Arabs.
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The average office desk has 400 times more bacteria on it than a toilet.
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Opium has influenced much of the world's most popular literature. The following authors were all opium users, of varying degrees: Lewis Carroll, Charles, Dickens, Arthur Conan Doyle, and Oscar Wilde.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.