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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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The average office desk has 400 times more bacteria on it than a toilet.