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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
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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.
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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.