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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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James Hansen

Director, NASA Goddard Institute for Space Studies

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

John Paul Stevens

Retired Supreme Court Justice

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John Paul Stevens | November 16, 2010 | Wortham Center | The Progressive Forum

George Lakoff

Cognitive Linguist

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George Lakoff | February 28, 2008 | Wortham Center | The Progressive Forum

Larry Wilmore

The Daily Show "Senior Black Correspondent"

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Larry Wilmore | February 25, 2009 | Wortham Center | The Progressive Forum

Joe Klein

Journalist, Columnist, Author

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Joe Klein | April 12, 2007 | Wortham Center | The Progressive Forum

T. Boone Pickens

Businessman, Energy Leader

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T. Boone Pickens | March 29, 2009 | Wortham Center | The Progressive Forum

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