Lots of people want to change the world. But how does change happen? History is filled with stories of people and institutions that spent big and devoted many resources to effect change but have little to show for it. By contrast, many societal developments have happened without forethought from anyone. And of course, change can be negative as well as positive. In each episode of this weekly program, Theory of Change host Matthew Sheffield delves deep with guests to discuss larger trends in politics, religion, media, and technology.