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There are 20 feet of blood vessels in each square inch of human skin.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.
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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.