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American voter registration rates have surged at historic levels in the first quarter of 2026. 40% were people 18 through 25. (3:15) | More videos from Ruth Ben-Ghiat »

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Michael Pollan

Acclaimed Thought Leader: Food, Nature, and Mind

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Sylvia Earle

Oceanographer

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

Richard Leakey

Paleoanthropologist, Conservationist, Statesman

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Richard Leakey | October 28, 2010 | Wortham Center | The Progressive Forum

Douglas Brinkley

Acclaimed Historian

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AL Gore

Nobel laureate, Environmentalist

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Al Gore | June 7, 2006 | Hobby Center | The Progressive Forum

Arianna Huffington

Founder, The Huffington Post

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

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