the real purpose of this show is to introduce you to aaron renn,, who is an expert on cities and has ted web channel, maybe the most successful web channel devoted to cities. what is it called, aaron? >> the urbanophile -- lover of cities. >> you are a lover of cities? >> i love cities like only someone who grew up in a town of 29 people can. [laughter] >> i grew up in zimbabwe. a friend of mine would walk in