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A Spanish city, in a bid to end congestion, has made its citizens an offer: Give up your car and ride our trolley for free, forever. People love their cars. They're willing to maintain a car even when it's expensive and difficult.

Dear Scientific American Reader: Scientific American is conducting a survey about the future of cities, the results of which will be published in the magazine along with a series of articles on urban life in the 21st century. The survey will poll elected officials, academics, policymakers, and opinion leaders, including Scientific American readers, about ways to improve cities and their livability.