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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 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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There are 20 feet of blood vessels in each square inch of human skin.
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There are more bacteria in your mouth than there are people in the world.