Talking to Jonathan Barnett about where the idea of megaregions came from, environmental planning within the landscape, the importance of transit connections in these regions, and how we can coordinate megaregions administratively.

The person who runs a city's Department of Transportation controls around 30 percent of the city's public space — and needs to think that way.

It's a special edition of the podcast this week, as we talk to an expert in how residents of a city interact with — and are sometimes exploited by — all our digital doodads.