Sun Jifa, of Guanmashan, Jilin province, in northern China, lost his hands in a fishing-related explosion a decade ago. The hospital recommended him prosthetic replacements that were far too expensive. Undeterred, Sun built his own bionic arms that can actually grip and squeeze objects via a system of pulleys and wires manipulated by movements of his elbows.
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.