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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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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.