Edit this Published in Freakonomics Radio Why Cities Rock Listen Queue Download this audio Want to embed this player? Use the code below. More info. <iframe width="600" height="130" frameborder="0" scrolling="no" src="//www.wnyc.org/widgets/ondemand_player/wnyc/#file=json/164230"></iframe> Share on Facebook Share on Twitter Email a Friend Could it be that cities are "our greatest invention" -- that, despite a reputation as black-soot-spewing engines of doom, they in fact make us richer, smarter, happier and (believe it!) greener?