Robin Chase rose to fame by founding Zipcar, the world’s biggest car-sharing business, but that was one of her smaller ideas. In this presentation she travels much farther, contemplating road-pricing schemes that will shake up our driving habits and a no-fee mesh network as sprawling as the United States Interstate highway system. But how could you build a free wireless system that vast and pervasive? Chase finds the answer in a few short lines from The Graduate. And it has nothing to do with plastic.