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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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The horizontal fraction bar was introduced by the Arabs.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.