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Welcome! We are an encyclopedia project, and more. We are a different sort of Web 2.0 project: We aim at credibility and quality, not just quantity. Both the general public and credentialed experts are encouraged to get involved. We use our real names, not pseudonyms. We're collegial. We have added over 4,600 articles (and many subpages), and over five million words. NEW: the Citizendium chooses CC-by-sa as its license! Read our first year progress report and accompanying press release. Contribute to Citizendium! New authors and editors welcome! Accounts usually approved within a few hours. Start here. Learn about us For readers: About the Citizendium For authors: The Author Role For editors: The Editor Role Initiatives Core Articles - tackle high priority topics Recruitment - help invite others to join Subpages - add other types of info to CZ Eduzendium - students write CZ articles for credit Support us We're a 501(c)(3) non-profit, and we need your support. If you shop at Amazon.com or Barnes & Noble, do so through our links! We'll get donations at no cost to you. (read more) - Search All Products. Link to us. Help increase our page rank by linking to us.	Some of our finest [ about ] Approved Articles Developed Articles (over 700) Draft of the Week [ about ] Notre Dame de Paris, western façade, seen from bottom to the top. Architecture is the art and technique of designing and constructing buildings to fulfill both practical and aesthetic purposes. It should be distinguished from both construction and civil engineering. Although there are certain building types like houses and public buildings that clearly fall inside the domain of architecture there are many other buildings and structures (for example factories, monuments, bridges, and many others) that can be seen as limit cases between architecture and engineering or architecture and art. [more...] New Draft of the Week [ about ] John Tyler, Jr. (March 29, 1790 – January 18, 1862) was a United States politician and the tenth President of the United States (1841-1845). He was Vice President to William Henry Harrison and succeeded him as President when Harrison died. Tyler was the first Vice President to succeed the presidency by the death of the previous president, and was given the nickname "His Accidency" by detractors.[more...]