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The horizontal fraction bar was introduced by the Arabs.
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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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Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.