The space heater nestled perpetually at my side this time of year can be pretty comforting, but it’s not great for my utility bills. It would be better to direct the heat in my house more efficiently, like capturing warmth from the refrigerator, computer, DVR and other appliances. This prototype phase-changing heater ‘bot would do just that.
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.