Garrett Graff's tells the oral histories of 9/11, from archive material he has collated to interviews he has conducted with people who responded to events on the day, such as one of the key advisors to Dick Cheney. He tells Dan some of those stories, such as the couple of firefighter and World Trade Center employee who sought to find each other in the confusion, to that of a man who survived being buried under 220 stories of the World Trade Center. Producer: Peter Curry