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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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There are approximately 3 million unintended pregnancies in the United States each year.
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The horizontal fraction bar was introduced by the Arabs.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.