Encyclopædia Britannica it is scarcely used, and reviewers have recommended that it be dropped from the encyclopaedia. The also has color transparencies of human anatomy and several appendices listing the staff members, advisors, and contributors to all three parts of the Britannica. Taken together, the and comprise roughly 40 million words and 24,000 images. The two-volume index has 2,350 pages, listing the 228,274 topics covered in the "Britannica", together with 474,675 subentries under those topics. The "Britannica" generally prefers British spelling over American; for example, it uses "colour" (not "color"), "centre" (not "center"), and "encyclopaedia" (not "encyclopedia"). However, there are exceptions to
Encyclopædia Britannica was "Encarta", now discontinued, a modern, multimedia encyclopaedia that incorporated three print encyclopaedias: "Funk & Wagnalls", "Collier's" and the "New Merit Scholar's Encyclopedia". "Encarta" was the top-selling multimedia encyclopaedia, based on total US retail sales from January 2000 to February 2006. Both occupied the same price range, with the "2007 Encyclopædia Britannica Ultimate" CD or DVD costing US$40–50 and the Microsoft Encarta Premium 2007 DVD costing US$45. The "Britannica" contains 100,000 articles and "Merriam-Webster's Dictionary and Thesaurus" (US only), and offers Primary and Secondary School editions. "Encarta" contained 66,000 articles, a user-friendly Visual Browser, interactive maps, math, language and homework