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Wikipedia's Accuracy Compared to Britannica
Raul654 writes "Nature magazine recently conducted a head-to-head competition between Wikipedia and Britannica, having experts compare 42 science-related articles. The result was that Wikipedia had about 4 errors per article, while Britannica had about 3. However, a pair of endevouring Wikipedians dug a little deeper and discovered that the Wikipedia articles in the sample were, on average, 2.6 times longer than Britannica's - meaning Wikipedia has an error rate far less than Britannica's." Interesting, considering some past claims. Story available on the BBC as well.
Nature also published an editorial which asks scientists to contribute to Wikipedia: "Nature would like to encourage its readers to help. The idea is not to seek a replacement for established sources such as the Encyclopaedia Britannica, but to push forward the grand experiment that is Wikipedia, and to see how much it can improve. Select a topic close to your work and look it up on Wikipedia. If the entry contains errors or important omissions, dive in and help fix them. It need not take too long. And imagine the pay-off: you could be one of the people who helped turn an apparently stupid idea into a free, high-quality global resource."
The current version of an article is changing, but a particular past version is static. If you really need to reference Wikipedia, you can go to the page history page and choose one of the version. They actually have a page on citing Wikipedia.