Favorite talks
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Play
Robert Hammond: Building a park in the sky
05:41 Posted: Jun 2011
Views: 485,990 | Comments: 83
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Hans Rosling: Global population growth, box by box
10:04 Posted: Jul 2010
Views: 1,327,005 | Comments: 511
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Dan Gilbert: The surprising science of happiness
21:16 Posted: Sep 2006
Views: 5,115,817 | Comments: 717