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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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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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Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.

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There are 20 feet of blood vessels in each square inch of human skin.

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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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