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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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There are approximately 3 million unintended pregnancies in the United States each year.
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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).