How can we understand the events, individuals and institutions that change the world? Can we use this to change things for the better? During this Geneva stop on his global book tour, Duncan Green introduced the arguments of his new book, "How Change Happens", which combines research with practical experience to explore the topic of social and political change. Drawing on many first-hand examples and insights from studying and working on international development, the book offers the latest thinking on what works to achieve progressive change.