A: London, England, United Kingdom, B: Chicago, Illinois, United States
Academics were often critical of articles in the Wikipedia, as the quality of the articles in that encyclopedia varied greatly in quality. However, n December 15, 2005 the journal Nature, published in London, conducted a peer-review comparison of selected science articles in the printed Encyclopedia Britannica, published in Chicago, which contains 65,000 articles by 4,000 contributors, and the online user-edited Wikipedia. The reviewers rated the Wikipedia nearly as accurate as Britannica.