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Illicit drug use costs the United States approximately $181 billion every year.

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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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The familiar sounds of your heart are made by the heart's valves as they open and close.

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Approximately 500,000 babies are born each year in the United States to teenage mothers.

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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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Video: Neurosynapse Animation

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