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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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