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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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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 first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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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).