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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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There are more bacteria in your mouth than there are people in the world.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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The horizontal fraction bar was introduced by the Arabs.
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Fewer than 10% of babies are born on their exact due dates, 50% are born within 1 week of the due date, and 90% are born within 2 weeks of the date.