The Lab is on vacation this week, so we’re rebroadcasting our interview with Professor Jim Waller. The threat of mass violence is on the rise in the United States, as demonstrated by the January 6 attack on the Capitol. Dr. James Waller, noted expert on mass violence and genocide, joins us this week to talk about the risk factors that contribute to widespread political and ethnic violence and to wrestle with the warning signs present in the United States today.