Sunlight is the best disinfectant, as the old saying goes. If you want to safeguard the lives and work of human rights activists, point a camera at them. Give them computers. Hand out satellite phones. Connect them to the Internet. This is the premise of Peter Gabriel's incredibly impactful group Witness. But, as Julia Scheeres reports, it's an approach which is spreading rapidly and in unexpected ways: In Argentina, forensic anthropologists are using DNA analysis to identify the bodies of thousands of people who were killed by the right-wing military dictatorship; Greenpeace is making "a solar-powered camera capable of streaming images over the Internet in real time from remote locations," while Muslim women are using hidden microcameras to document abuses at the hands of religious authorities.