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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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Sylvia Earle

Oceanographer

Sylvia Earle | April 5, 2011 | Wortham Center, Houston | The Progressive Forum

Nicholas Kristof & Sheryl WuDunn

Pulitzer Prize Winning Authors

Joyce Vance

Former U.S. Attorney & Legal Analyst

Ken Burns

Acclaimed Documentary Filmmaker

Ken Burns | November 13, 2007 | Wortham Center | The Progressive Forum

Katharine Hayhoe

Leading Climate Scientist

Leading Climate Scientist Dr. Katharine Hayhoe | The Progressive Forum

Heather Cox Richardson

Acclaimed Historian

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