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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.