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  Quora

  Quora: the best answer to any question.
  http://www.quora.com

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  Word Reference

  Free online dictionaries - Spanish, French, Italian, German and more. Conjugations, audio pronunciations and forums for your questions.
  http://www.wordreference.com

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  Ted.com

  TED is a nonprofit devoted to Ideas Worth Spreading - through TED.com, our annual conferences, the annual TED Prize and local TEDx events.
  http://www.ted.com