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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.