Programmable thermostats help save money by resetting the temperature when homeowners are asleep or away. But setting them up can be painstaking, and 89 percent of users never get them out of manual mode. The Nest thermostat requires almost no setup and teaches itself when to adjust the temperature.
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.