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Asthma cases in Americans are about 75% higher today than they were in 1980.
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There are approximately 3 million unintended pregnancies in the United States each year.
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Thyroid conditions may make getting pregnant impossible.
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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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Excessive alcohol use costs the country approximately $235 billion every year.