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Did you know?
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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There are 20 feet of blood vessels in each square inch of human skin.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.