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Everyone has one nostril that is larger than the other.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.