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In 1864, the first barbiturate (barbituric acid) was synthesized.
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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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There are more nerve cells in one human brain than there are stars in the Milky Way.