People often credit their IDEAS to individual "Eureka!" moments. In his TED talk, Steven Johnson shows how history tells a different story. His fascinating tour takes us from the "liquid networks" of London's coffee houses to Charles Darwin's long, slow hunch to today's high-velocity web. In his book: Where Good Ideas Come From: The Natural History of Innovation, Johnson tells the fascinating stories of great ideas and great thinkers across disciplines. From Darwin and Freud