Teacher David Sherrin presents an exercise called "Sorting People" to his 9th graders at the Facing History School. The outcome? Well, have a listen. How accurately can you guess a person's background from their appearance? Reporter Ali Abbas takes us to Baghdad, where that question has become an issue of life and death as tensions and violence have risen between Sunni and Shi'a in Iraq, and safety can come down to the spelling of your name.