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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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The human body produces and destroys 15 million blood cells every second.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.