The use of volunteers was integral in creating and maintaining Wikipedia. Another milestone was Ted Nelson's hypertext design Project Xanadu, which was begun in 1960. Wells' book of essays World Brain (1938) and Vannevar Bush's future vision of the microfilm-based Memex in his essay " As We May Think" (1945). This concept of a machine-assisted encyclopedia was further expanded in H. The idea of using automated machinery beyond the printing press to build a more useful encyclopedia can be traced to Paul Otlet's 1934 book Traité de Documentation Otlet also founded the Mundaneum, an institution dedicated to indexing the world's knowledge, in 1910. The concept of compiling the world's knowledge in a single location dates back to the ancient Library of Alexandria and Library of Pergamum, but the modern concept of a general-purpose, widely distributed, printed encyclopedia originated with Denis Diderot and the 18th-century French encyclopedists. According to comScore, Wikipedia receives over 117 million monthly unique visitors from the United States alone. Worldwide in September 2018, WMF Labs tallied 15.5 billion page views for the month. Wikipedia's worldwide monthly readership in 2014 was approximately 495 million. In practice, Wikipedia quickly overtook Nupedia, becoming a global project in multiple languages and inspiring a wide range of other online reference projects. Initially, Wikipedia was intended to complement Nupedia, an online encyclopedia project edited solely by experts, by providing additional draft articles and ideas for it. In 2001, the license for Nupedia was changed to GFDL, and Wales and Sanger launched Wikipedia using the concept and technology of a wiki pioneered in 1995 by Ward Cunningham. This contrasted with contemporary digital encyclopedias such as Microsoft Encarta, Encyclopædia Britannica, and Bomis's Nupedia, which was Wikipedia's direct predecessor. Stallman's concept specifically included the idea that no central organization should control editing. Its technological and conceptual underpinnings predate this the earliest known proposal for an online encyclopedia was made by Rick Gates in 1993, and the concept of a free-as-in-freedom online encyclopedia (as distinct from mere open source) was proposed by Richard Stallman in 1998.
Wikipedia began with its first edit on 15 January 2001, two days after the domain was registered by Jimmy Wales and Larry Sanger. Wikipedia's Main Page as it appeared on 20 December 2001 Including all language editions, Wikipedia has 61,497,302 articles, equivalent to around 23,100 print volumes. The English edition of Wikipedia has grown to 6,690,394 articles, equivalent to more or less 3,100 print volumes of the Encyclopedia Britannica.
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