In the past three years, the thought of companies like Chevrolet and Nissan selling lithium-ion-powered cars has gone from laughable to old news. Late this year, the plug-in Chevy Volt and pure-electric Nissan Leaf arrive. Carmakers from Ford to Toyota will follow in 2011 and 2012 with new electrified models of their own. In the beginning, the electric-car revolution probably won’t seem so revolutionary: a few thousand cars here and there.
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.