- U.S. Presidents Trivia Quiz at WorldBook.com
- Presidents Day Quiz at AOL Research & Learn
- 20th Century U.S. Presidents Quiz at Biography.com
- Quiz: U.S. Presidency at BBC News
Happy Presidents Day!
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Happy Presidents Day!
surfactant | |
Definition: | A chemical agent capable of reducing the surface tension of a liquid in which it is dissolved. |
Synonyms: | wetting agent, surface-active agent, wetter |
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