It's been 40 years in the making. This week Samsung finally announced they've kicked phase-change memory (PCM) into mass production. In a nutshell, PCM stores information by melting and freezing microscopic crystals. In gadgets like cell phones, its frozen-in-place nature means lightning-fast bootup times--instantaneous, even.
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.