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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 shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.
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The longest a person has survived after a heart transplant is 24 years.
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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.
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The familiar sounds of your heart are made by the heart's valves as they open and close.