User-created content provides a challenge, in that it will be difficult to verify the accuracy of each educational resource. Educators often comment that Wikipedia, while very useful, is made by experts and non-experts alike, potentially decreasing its credibility. While research conducted by Nature magazine determined that Wikipedia comes close to the Encyclopedia Britannica in terms of accuracy of science entries (Giles, 2005), it also shows that collaborative approaches to knowledge sharing require facilitation and editing. No matter what printbased or online source students use to substantiate their course work, they should use multiple sources to check the validity, reliability, and potential bias of information.