Pulitzer Prize-winning biographer Jon Meacham on the evolution of Abraham Lincoln's moral principles and political leadership -- and what the era of Lincoln can teach us about the state of our democracy today.
Harvard professor Marc Hauser shares the latest research on animal behavior and psychology in his new book. He joins Diane to discuss whether animals think, feel, and reason, and what a deeper understanding of animal intelligence can teach us about humans.
- Marc Hauser Professor of Psychology, Organismic and Evolutionary Biology, and Biological Anthropology at Harvard University and author of "Wild Minds."
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