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The longest a person has survived after a heart transplant is 24 years.
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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.