Perhaps, Google was tired of sending out Wikipedia search links with almost every inquiry so the search company created its own wiki-style online encyclopedia called Knol--a unit of knowlege. ZDNet's Garett Rogers says Knol could eventually "suck the life" out of Wikipedia.
The main difference between Wikipedia, which is often criticized for letting inaccuracies slip through its publishing process, and Knol, is that Knol articles will most often carry a byline. Knol also allows readers to rate the articles, post a comment, and write a competing article on the same subject.
Knol home page. Remember you can click on any screenshot to expand.