The leading biotech company to use embryonic stem cell treatment withdrew its funding for research last month. Critics worry this move could set back stem cell research for years. Also, new scientific discoveries: another Earth-like planet, the largest black holes ever found, and the possibility that Mars had once sustained life. We're joined by Midday's Science contributor, John Monahan, science educator and author of They Called Me Mad: Genius, Madness, and the Scientists Who Pushed the Outer Limits of Knowledge