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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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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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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.





