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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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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 word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.