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Fri, Nov 16, 2012 -- 2:00 AM

TED Radio Hour

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The Future of Cities -- For centuries, cities have been bringing people together. Now, for the first time in history, more than half the world's population lives in cities. What draws people to them? What changes when we live closer together? How can cities offer humanity its best hope for a sustainable future? Several TED speakers investigate the future of our urban zones.

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