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Vaccines prevent between 2.5 and 4 million deaths every year.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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The horizontal fraction bar was introduced by the Arabs.
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Certain chemicals, after ingestion, can be converted by the body into cyanide. Most of these chemicals have been removed from the market, but some old nail polish remover, solvents, and plastics manufacturing solutions can contain these substances.
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Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.