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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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There are 60,000 miles of blood vessels in every adult human.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.