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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.
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The average office desk has 400 times more bacteria on it than a toilet.