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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.
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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 first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Everyone has one nostril that is larger than the other.