." Hawking, who has Lou Gehrig’s disease and speaks via a synthesizer, said in one TV spot, "My body may be stuck in this chair, but with the Internet my mind can go to the end of the universe."13 Hawking's expert power derives from the knowledge he possesses about a content area. This helps to explain the weight many of us assign to professional critics’ reviews of restaurants, books, movies, and cars—even though, with the advent of blogs and open-source references such as Wikipedia, it’s getting a lot harder to tell just who is really an expert!14