For guys on a job site drilling hundreds of holes a day, power matters—it lets them work faster and blow through knots, nails and other obstructions. That’s why corded tools, with their bigger, stronger motors, still reign for contractors, and why DeWalt challenged its engineers to deliver even more oomph. Their answer: a motor that squeezes in extra copper to deliver 40 percent more power.
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.