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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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There are more bacteria in your mouth than there are people in the world.
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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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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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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.