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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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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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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.