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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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The horizontal fraction bar was introduced by the Arabs.
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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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The average office desk has 400 times more bacteria on it than a toilet.