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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The average office desk has 400 times more bacteria on it than a toilet.
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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.