Reviving the gun debate Midmorning discusses new thinking about gun control and violence and what may be behind the the recent spate of school shootings.9:06 a.m.
Eric Thompson: Creator of Gundebate.com. He is also an internet gun dealer who sold gun accessories to the Northern Illinois University campus shooter Stephen Kazmierczak and a gun to Virginia Tech campus killer Seung-Hui Cho.
Robert Spitzer: Professor of political science at SUNY Cortland. He is author of The Politics of Gun Control.
Ambassador of the seas Since the time she was 13, Sylvia Earle has been fascinated by the sea. Now in her 70s, the woman known as "Her Deepness" remains one of the most vocal advocates for the health of the world's oceans.10:06 a.m.
Sylvia Earle: Marine biologist and oceanographer, currently a National Geographic Explorer-in-Residence. In the 1990s she served as the Chief Scientist for the National Oceanographic and Atmospheric Administration.