Long gone are the days of pushing plastic armies around hand-drawn maps. Today’s military planners deserve technology of the future, and that means nothing less than 3-D holograms will do. Luckily, we have DARPA, ever-ready to step in with a solution.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.