Official site of the Encyclopedia Britannica, one of the world's best-known reference books. Find short encyclopedia entries and definitions, or register for complete access. - (Read more)

Online encyclopedia, dictionary, atlas, and other reference tools from MSN Encarta. Find encyclopedia entries, dictionary definitions, and homework help. - (Read more)

Online encyclopedia specializing in short, inter-linked articles about anything from famous actors to "psychological phobias. - (Read more)

Articles, facts and trivia about animals, health, sports, travel and more. - (Read more)