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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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Less than one of every three adults with high LDL cholesterol has the condition under control. Only 48.1% with the condition are being treated for it.