The interrogator - Few know more about the 9/11 investigation than Ali Soufan, who questioned members of al Qaeda after the attack. The former FBI agent reveals himself for the first time and talks about his interrogations in an interview with Lara Logan. Remembering 9/11 -Ground Zero responders relive their haunting experiences on the tenth anniversary of the 9/11 attacks for a "60 Minutes" segment about their road to recovery and the doctor who is preserving their oral histories.