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The app leads you to various locations around London using either the map or GPS. Once you’re there, click the “3D View” button, and the app will recognize the location and overlay the historical photograph over the live video feed of the real world, giving you a brief glimpse into how the past looked.

Computer science researchers at the University of Washington and Cornell University are deploying a system that will blend teamwork and collaboration with powerful graphics algorithms to create three-dimensional renderings of buildings, neighborhoods and potentially even entire cities.

To improve the quality of their rendering capabilities, the researchers plan to integrate their computing system with a social game that will permit competing teams to add images where they are most needed to improve the quality of the visual models. The PhotoCity game is already being played by teams of students at the University of Washington and Cornell, and the researchers plan to open it to the public in an effort to collect three-dimensional renderings in cities like New York and San Francisco. Contestants will be able to use either an iPhone application that uses the phone’s camera, or upload collections of digital images.

“The obvious thing to do is to try to mobilize a lot of people and get them to go out and take snapshots that contribute to this 3-D reconstruction,” he said. “But maybe if enough people are involved someone will come up with a better idea of how to go about doing this.”

Time Inc.’s Fortune is keeping its name, but a redesign aims to reflect a time when many of its readers have less of the prosperity that the name suggests.

Fortune also is aiming for a more high-end feel, with a switch to heavier paper stock. The changes come as the magazine drops its frequency to 18 issues from 25 issues.

100Eyes is edited by Andy Levin and made possible by the donation of photographic work by photographers from around the world.