Graca Machel; 'The Great War'; Antonia Fraser; Garry Marshall

Graca Machel, former minister of education for Mozambique, explains the findings in her United Nations report on the impact of armed conflict on children around the world. Actor Michael York and filmmaker Blaine Baggot describe the eight-part PBS series "The Great War and the Shaping of the 20th Century." Author Lady Antonia Fraser talks about the 1605 Gunpowder Plot in England, recounted in her book "Faith and Treason." Director Garry Marshall talks about his film "Dear God," starring Greg Kinnear as a postal worker who responds to letters addressed to God.