Although televised and Internet reporting bring the violence of battle into our daily lives in new, unsettling ways, the last few decades have actually seen a dramatic decline in the intensity of wars across the globe. In a word, the great untold story of our era is peace.Demographers measuring the phenomenon agree about its reality, but they disagree both about its origins and its trajectory. Those of us who take world peace seriously face some important questions. Lately we appear to be doing something right—so what is it? And can we keep doing it? How long will the era of peace continue? What drives it, and what threatens it?To discuss these weighty questions, we've invited Professor Andrew Mack, the Director of the Human Security Report Project at Simon Fraser University; Professor Erik Gartzke of the University of California, San Diego; Professor John Owen of the University of Virginia; and Bartosz Stanislawski, the director of Syracuse University's Mapping Global Insecurity-Global Black Spots Research Program.