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Vaccines prevent between 2.5 and 4 million deaths every year.
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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The FDA recognizes 118 routes of administration.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").