A flash of genius, a stroke of innovation, a eureka moment. An idea is often thought of as a single event, but there's generally a longer and more complex process that precedes a "lightbulb moment." In this TED talk, researcher Steven Johnson looks at the environment that creates innovation. Did you know that coffee houses may well have helped spark the innovative ideas of the Enlightenment? Check out the video in the panel at right to learn more about the nature of innovation.