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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Illicit drug use costs the United States approximately $181 billion every year.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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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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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.