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Cyanide works by making the human body unable to use oxygen.
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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
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The horizontal fraction bar was introduced by the Arabs.
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Patients who have been on total parenteral nutrition for more than a few days may need to have foods gradually reintroduced to give the digestive tract time to start working again.
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In 1864, the first barbiturate (barbituric acid) was synthesized.