In the article, titled “Mass Shootings in America: Moving Beyond Newtown,” Northeastern University criminologists James Alan Fox and Monica J. DeLateur examine existing research and data to refute 11 common assumptions about mass murder—which the FBI defines as any single, sustained incident that takes the lives of four or more victims. Many of their points seem like the starting point for a conversation rather than the end of one. But if we’re going to have a national conversation about mass shootings—and we’re already having it—then it might as well be based on data rather than assumptions.