9/11: Ten Years Later

On the 10th anniversary of 9/11, Janet Napolitano of the Department of Homeland Security reviews the lessons we learned and the measures we've taken to improve our national security. Philip Zelikow, who served as executive director of the 9/11 Commission, talks about where we are today and the re-published 9/11 Commission Report. Filmmakers Gedeon and Jules Naudet, along with co-director and former firefighter James Hanlon, talk about the CBS documentary "9/11: Ten Years Later," which investigates why firefighters who worked at Ground Zero are becoming sick.