The Trend: Internet-connected energy monitors. They grab details on electric use from your wiring and send them to a Web site where you can analyze the data—and figure out how to save both watts and cash.
Why Now: Utilities keep promising “smart” electric meters that automatically provide real-time, online info, but most Americans still don’t have them. Now millions of stimulus dollars are inspiring companies to create and sell kits that add smart features to any ordinary meter.
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.