Clay Aiken became a household name through American Idol. He’s here today to talk about becoming a UNICEF ambassador, and working to bring the everyday lives of children in Afghanistan to the spotlight. Then, a psychologist explains why reports of genocide often get little response. Later on, a discussion about how to understand and appreciate photography. And we talk about the importance of Marc Chagall's art. Plus: a historian argues that teen culture was created in the 1890s.