Triumph of the City: how our greatest invention makes us richer, smarter, greener, healthier and happierVideoTriumph of the City: how our greatest invention makes us richer, smarter, greener, healthier and happier14 March 2011Professor Edward GlaeserAudioTriumph of the City: how our greatest invention makes us richer, smarter, greener, healthier and happier14 March 2011Professor Edward Glaeser