Google’s answer to Wikipedia, Knol, launched Wednesday. Knols are articles about specific topics written by experts on that subject. Unlike Wikipedia, every knol entry will have an author, or a group of authors, whose name is prominent. People can also submit comments, and rate and review knols.  Every knol will be like a Web page. Cedric Dupont, Knol product manager, told ZDNet.co.uk: “In the long-term, we hope that encyclopedias, such as Wikipedia, would use knols as references…If Knol is successful, it will help Wikipedia.”