In this hour of Radiolab, we take to the street to ask what makes cities tick.
There's no scientific metric for measuring a city's personality. But step out on the sidewalk, and you can see and feel it. Two physicists explain one tidy mathematical formula that they believe holds the key to what drives a city. Yet math can't explain most of the human-scale details that make urban life unique. So we head out in search of what the numbers miss, and meet a reluctant city dweller, a man who's walked 700 feet below Manhattan, and a once-thriving community that's slipping away.
CORRECTION: An earlier version of this program indicated that the Dow Jones Industrial Average originated in the 1920’s. In fact, it originated in the 1890’s; during the 1920’s it was expanded to include 30 companies, the number it includes today. The audio has been adjusted in consideration of this fact.