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Did you know?
There are 60,000 miles of blood vessels in every adult human.
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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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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The average adult has about 21 square feet of skin.