From the article: "In order to test its reliability, Nature conducted a peer review of scientific entries on Wikipedia and the well-established Encyclopedia Britannica.
The reviewers were asked to check for errors, but were not told about the source of the information.
'Only eight serious errors, such as misinterpretations of important concepts, were detected in the pairs of articles reviewed, four from each encyclopedia,' reported Nature.
'But reviewers also found many factual errors, omissions or misleading statements: 162 and 123 in Wikipedia and Britannica, respectively.'
Wikipedia founder Jimmy Wales welcomed the study.
'We're hoping it will focus people's attention on the overall level of our work, which is pretty good,' he said."
I'm surprised and glad all at the same time.