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In 1864, the first barbiturate (barbituric acid) was synthesized.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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Thyroid conditions may make getting pregnant impossible.
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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.