BackTalk, a project of M.I.T.’s Senseable City Lab that is now on display at the Museum of Modern Art in Manhattan, seeks to better understand what becomes of the three million tons of electronic waste disposed of annually in the United States...[Half] of the BackTalk exhibit is a visualization of the whimsical wanderings of e-waste across the United States...[Assaf Biderman, associate director of the Senseable City Lab] describes e-waste as an enormous and pressing challenge. “It represents both a source of great value and a potential toxic environmental hazard,” he said.