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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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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.