http://www.nytimes.com/2010/06/05/arts/design/05wiki.html
QUOTE
Once criticized as amateurism run amok, Wikipedia has become ingrained in the online world: it is consulted by millions of users when there is breaking news; its articles are frequently the first result when a search engine is used. This enhanced role has moved hand in hand with Wikipedia’s growing stability (some would say stagnation). With more than three million articles in English alone, there are fewer unexplored topics, and many of the most important articles have been edited thousands of times over a number of years.
Perhaps they could try exploring the philosophy articles, or the 'Jobless recovery' economics articles.