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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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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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About one in five American adults and teenagers have had a genital herpes infection—and most of them don't know it. People with genital herpes have at least twice the risk of becoming infected with HIV if exposed to it than those people who do not have genital herpes.
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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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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.