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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Everyone has one nostril that is larger than the other.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.