March 27, 2003

Black soldiers played an integral part in America's wars, even though they weren't fully accepted or respected. Gail Buckley, history writer, talks with Todd about the treatment of African Americans who fought for the United States throughout history, and how they remained loyal despite intolerance. Her book is "American Patriots: The Story of Blacks in the Military From the Revolution to Desert Storm".

Todd is joined by Daniel Bolnick, a graduate student in the Department of Evolution and Ecology at the University of California, Davis. They discuss his recent research, which found that animals from the same species often have varying food preferences. Bolnick also explains why ignoring preferences could harm efforts to protect endangered species.

Steve Sarro, Species Survival Plan Coordinator for the Baltimore Zoo, talks with Todd about ensuring genetic diversity among the captive population of the African black-footed penguin. By examining the ancestry of these penguins in zoos nationwide, he works to breed certain animals to maintain a healthy group.