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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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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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In 1864, the first barbiturate (barbituric acid) was synthesized.
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There are 60,000 miles of blood vessels in every adult human.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.