Before Ford's Model T entered mass production, cars were largely a novelty, a curio for those privileged enough to afford them. They sputtered odorous gases, crawled at speeds barely faster than a horse's gallop, and stirred up so much dust that you'd need to wash up after disembarking. Pretty cool!
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.