Dr. Alexander Riley, Professor of Sociology at Bucknell University in Lewisburg, PA, and author of the study "Angel Patriots: The Crash of United Flight 93 and the Myth of America," issued in 2015 by NY University Press. Dr. Riley speaks on the eve of the 20th anniversary of 9/11 about the changes in the country over two decades and the changes in his understanding of the event and its memorialization. www.bucknell.edu