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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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There are more bacteria in your mouth than there are people in the world.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.