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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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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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Blood is approximately twice as thick as water because of the cells and other components found in it.