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In 1864, the first barbiturate (barbituric acid) was synthesized.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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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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There are 20 feet of blood vessels in each square inch of human skin.
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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.