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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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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Everyone has one nostril that is larger than the other.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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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.