Evan Thomas; 'NYPD Blue'; Dr. David A. Hamburg

Evan Thomas of Newsweek talks about why Colin Powell chose not to run for president, and describes the four operatives profiled in "The Very Best Men: Four Who Dared: The Early Years of the CIA." Executive producer David Milch and former NYPD homicide detective Bill Clark discuss "NYPD Blue." Dr. David A. Hamburg offers recommendations from his 10-year study on teenagers, detailed in his book "Great Transitions: Preparing Adolescents for a New Century."