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Welcome to Citizendium

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A 15-year experiment in a Wikipedia-like setting

Welcome to Citizendium, a wiki for providing free knowledge where authors use their real, verified names. We welcome anyone who wants to share their knowledge by writing and improving articles on virtually any subject.

This wiki was unsuccessful in achieving its original goals (see A dedicated few writers have continued working in the wiki, improving articles that they believe are useful, and which for various reasons probably could not be written in Wikipedia. On or about Sept. 30, 2020, we plan to end Citizendium as a public "open" project, yet (possibly) keep the wiki running and editable by a combination of donations and subscriptions. How this might occur is still being examined.

See Recent Changes—an overview of articles we are writing now.

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Funds are used to pay for hosting our servers.
See our financial report for complete details.
Please make your donations here.

Some of our finest


Citable Articles (166)
Developed Articles (1,135)
(16,860 total articles)

All the world is a laboratory to the inquiring mind.
Martin H. Fischer

       —add a quotation about knowledge or writing
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Questions and answers to help you find the information you need

More about the project