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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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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 lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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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 the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.