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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
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The human body produces and destroys 15 million blood cells every second.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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.