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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The average adult has about 21 square feet of skin.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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Serum cholesterol testing in adults is recommended every 1 to 5 years. People with diabetes and a family history of high cholesterol should be tested even more frequently.