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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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Larry Wilmore

The Daily Show "Senior Black Correspondent"

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

Cecile Richards

President, Planned Parenthood Federation

Cecile Richards | January 27, 2014 | Wortham Center | The Progressive Forum

T. Boone Pickens

Businessman, Energy Leader

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

George Lakoff

Cognitive Linguist

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

Gloria Steinem

Feminist, Activist, Writer

Gloria Steinem | September 17, 2007 | Wortham Center | The Progressive Forum

Frank Rich

Columnist

Frank Rich | October 29, 2006 | Wortham Center | The Progressive Forum