The I-35W bridge over the Mississippi in Minneapolis collapsed during rush hour on August 1, 2007, plunging dozens of cars and their occupants into the river. The calamity disrupted transportation, aimed a spotlight on public infrastructure, and evoked an outpouring of public response.
What's at the heart of heroism?
Research suggests that selfless and altruistic behavior may be more hardwired in some people than others.
Guests
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Samuel Oliner: Sociology professor at Humboldt State University in California. He is the founder and director of the Altruistic Personality and Prosocial Behavior Institute.
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Stephen Post: Professor of bioethics at Case Western Reserve University's medical school. He is author of "Why Good Things Happen to Good People: The Exciting New Research that Proves the Link Between Doing Good and Living a Longer, Healthier, Happier Life."
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David Sloan Wilson: Evolutionary biologist at State University of New York at Binghamton.
Resources