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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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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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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.