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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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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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If all the neurons in the human body were lined up, they would stretch more than 600 miles.