The symbols of 9/11 haven’t changed much in eight years. There are the groups of firefighters, the hundreds of American flags and of course those two iconic towers, on fire. But a new documentary by two Chicagoans seeks to refresh our image bank of that day. 102 Minutes that Changed America first aired last year on the History Channel and is now up for four prime-time Emmy Awards, including Outstanding Nonfiction Special. The program traces the morning of September 11, 2001, through video captured by thousands of eyewitnesses in Manhattan. It then recreates the events in real time, from the moment the first plane hit until the minute the second tower fell. Producers Jon Siskel and Greg Jacobs discuss their documentary, which will air again this evening.