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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Your heart beats over 36 million times a year.
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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.