The Berlin Wall came down 20 years ago today. We’ll discuss the events that led to that historic event and how the former Soviet Bloc has changed since the Iron Curtain was lifted. We’re joined by Stephen Kotkin, Professor of Modern and Contemporary History and of International Affairs at Princeton University, whose most recent book (written with Jan T. Gross) is Uncivil Society: 1989 and the Implosion of the Communist Establishment, and Stephen F. Cohen, Professor of Russian Studies at New York University, whose most recent book is Soviet Fates and Lost Alternatives: From Stalinism to the New Cold War.