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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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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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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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There are more bacteria in your mouth than there are people in the world.