Digital billboards were part of the city-wide effort to nab the Boston Marathon suspects, but many cities are trying to turn the lights off. Could this use save the future of digital billboards? As part of our BURN: An Energy Journal partnership, we look at the military’s Rapid Equipping Force, a think tank that uses technology to solve these problems as soon as possible. Also, how funny can six seconds get? A look at Twitter's upcoming comedy festival with Comedy Central.