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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.