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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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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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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.