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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.