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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

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

Anthony Romero

ACLU Executive Director

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ACLU Executive Director Anthony Romero

Arianna Huffington

Founder, The Huffington Post

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Arianna Huffington | September 15, 2010 | Wortham Center | The Progressive Forum

Cecile Richards

President, Planned Parenthood Federation

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

Joe Klein

Journalist, Columnist, Author

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

Tim Flannery

Scientist, Naturalist, Author

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Tim Flannery | March 19, 2007 | Wortham Center | The Progressive Forum

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