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   Category: Reference>  
    Statistics & Facts  
   Includes almanac, atlas, dictionary and encyclopedia.
       WolframAlpha Computational Knowledge Engine
   WolframAlpha is not a search engine. It generates output by doing computations from its own internal knowledge base, instead of searching the web and returning links. Their goal is to accept completely free-form input, and to serve as a knowledge engine that generates powerful results and presents them with maximum clarity.