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In 1864, the first barbiturate (barbituric acid) was synthesized.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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There are approximately 3 million unintended pregnancies in the United States each year.
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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.