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Episode 804: Cities

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Over 50% of the planet now lives in cities. This hour, Radiolab looks at what makes them tick. We talk to a couple physicists who think they can fit every city into a tidy mathematical formula, and we take to the streets to test their idea. We explore the water tunnels 700 feet below Manhattan and question whether cities are the source of, or the solution for, our growing global appetite.

For more information, visit http://www.radiolab.org/.