How to Spot a Digitally Altered Photograph

Thanks to CSI and its myriad spinoffs, the kids these days love the forensics—the investigative kind, not public speaking, alas. We aren’t much interested in crime scenes (except those high fashion ones by photographer Melanie Pullen), but count us in for an hour-long network drama focused on digital forensics. The June issue of Scientific American includes a feature on the nascent profession by Dartmouth computer science professor Hany Farid, in which he not only begins a sentence with one of our favorite phrases (“In Stalin‘s day…”) but also offers up a sidebar with five