Good ideas power the world. But a good idea isn't enough to create change in the world. To create something new, something world-changing, a new idea has to take a form that fits the needs of enough people. Ideally, at least in a business, enough people who want to pay for it!
Technology and startup culture has transformed the world of innovation from gut hunches and experienced intuition to something more like science. Entrepreneurs in the 21st Century form hypotheses and test them to see if their hunches will survive the reality of the market.