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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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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.