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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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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Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.