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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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By definition, when a medication is administered intravenously, its bioavailability is 100%.
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The longest a person has survived after a heart transplant is 24 years.
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.