Responding to natural disasters, war and refugee crises, the Red Cross continues to play a huge role in relief efforts around the world and across the U.S. A look at the early history of the American organization with Marian Moser Jones, assistant professor at the University of Maryland School of Public Health and author of "The American Red Cross: From Clara Barton to the New Deal." Original air date 9/24/13
Since its formation more than 4.5 billion years ago, Earth has gone through five waves of extinction, the latest being the extinction of the dinosaurs, which scientists believe was caused by an asteroid. In "The Sixth Extinction: An Unnatural History," the New Yorker's Elizabeth Kolbert warns of what some scientists are defining as the "Sixth Extinction," which she says is happening now at the hands of mankind. Original air date 4/17/14
Robin Williams, one of the greatest comics of his generation who spoke openly about his battles with depression, took his own life at his home in California Monday. He was 63, and the nation and world today mourns the loss of a comic genius known for many roles in television, film, and on stage as a manic stand-up with incredible improvisational skills. Our guests: Midday film critic Christopher Llewellyn Reed, chair of the Film and Video Dept.