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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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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.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.