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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Cyanide works by making the human body unable to use oxygen.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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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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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.