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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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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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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.