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Your books discuss big questions of entire civilizations. How would you encourage others to cultivate the big questions? (1:21) | More videos from Jared Diamond »

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Lester Brown

Founder: Earth Policy Institute

Lester Brown | April 28, 2009 |  October 6, 2013 | The Progressive Forum

James Hansen

Director, NASA Goddard Institute for Space Studies

James Hansen | December 7, 2009 | Wortham Center | The Progressive Forum

David Eagleman

Leading Neuroscientist

John Kerry

Former Secretary of State, U.S. Senator, Democratic Presidential Candidate

Heather Cox Richardson

Acclaimed Historian

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