Aiming to create a more authoritative source of information than Wikipedia, the free online encyclopedia that allows anyone to post or edit subject-matter entries, Wikipedia co-founder Larry Sanger is getting ready to launch a new collaborative web site. Called Citizendium, the new site will require posters to register their names and has tapped subject-matter experts to serve as content editors.

Since its launch in 2001, Wikipedia has grown into a clearinghouse of free information on topics ranging from medieval art to nanotechnology. But critics say its strength--the fact that anyone can post or edit a...

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