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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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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.

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

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The most common treatment options for addiction include psychotherapy, support groups, and individual counseling.

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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

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