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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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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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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).