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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Vaccines prevent between 2.5 and 4 million deaths every year.