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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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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."