60 Minutes Overtime, 11.24.13

Why a group of veterans with PTSD allowed 60 Minutes cameras to record their gut-wrenching therapy sessions and air them on national television; then, Bestselling author Malcolm Gladwell objects to critics who say he fails to credit other people's works; also, In an interview with Anderson Cooper on 60 Minutes, author Malcolm Gladwell critiques his bestselling book, "The Tipping Point"; and, On the 50th anniversary of JFK's assassination, former Secret Service agent Clint Hill remembers his emotional interview with Mike Wallace in 1975.