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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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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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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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Illicit drug use costs the United States approximately $181 billion every year.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.