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An encyclopedia (or encyclopædia) is a comprehensive written compendium that contains information on either all branches of knowledge or a particular branch of knowledge.

Explore the updated online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of articles, biographies, videos, images, and web sites.

Wikipedia (pronunciation) is a free, multilingual encyclopedia project operated by the non-profit Wikimedia Foundation. Its name is a portmanteau of the words wiki (a technology ...

MSN Encarta: your gateway for interactive learning on the Web. ... There is some truth to the notion that kids benefit from listening to an orchestra. Time to play that 'Nutcracker ...