"Were there school lessons in Auschwitz?" Mayer Hersh spent his teens in Nazi camps and lost his family. He overcame the grief, the nightmares and the guilt to relive his experience again and again giving public talks about the Holocaust, and answering their questions. His talks reawakened the pain. Also Radio 4 legend Harriet Cass reads the bulletin of listeners' news. With Jennifer Tracey and Eddie Mair. iPM@bbc.co.uk.