History is filled with stories of bold pioneers who changed the world with their visionary ideas. There exists also, in the annals of innovation, a rich tradition of mad scientists with crazy inventions. These two notions are not mutually exclusive. In fact, many celebrated breakthroughs were initially met with scorn and ridicule. We've compiled 11 such world-famous ideas from the history of science and technology. The temptation, of course, is to include those ideas that were scorned and should have stayed scorned. The Star Wars prequels, say. But we're trying to run a classy operation here.