(6/25/21) Why do societies change course? The question is critical to the historical study of any era but is just as important today. In his book Disruption: Why Things Change, David Potter, the Francis W. Kelsey Collegiate Professor of Greek and Roman History at the University of Michigan, argues that paradigm shifts always begin on the fringes. Join us for a look at how an idea takes hold on a mass scale and why in this installment of Leonard Lopate at Large on WBAI.