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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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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Medication errors are more common among seriously ill patients than with those with minor conditions.