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Science fights the fakes

The digital world has made it embarrassingly easy to fake a photograph, as illustrated by the doctored Beirut-bombing photo, the bogus Kerry-and-Fonda pairing and the Katie Couric slim-down plan. The good news is that digital tools are providing new ways to detect image manipulation - in fact, a Dartmouth College researcher says he's helping The Associated Press develop a system for finding fakes on the fly. The bad news is that this could mark just one more phase in an "arms race" between the fakers and the fake-fighters.