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If you could remove all of your skin, it would weigh up to 5 pounds.
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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.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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There are more bacteria in your mouth than there are people in the world.
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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).