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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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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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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.