While I love my fancy Garmin watch, most runners don’t need $400 worth of tech on their wrist. That’s why the Nike+ iPod system is so brilliant: cheap, stupid-simple and gives you the basic info—time, pace, distance—automatically uploaded to Nike’s training site. Which is why the utter lack of innovation since the system debuted more than two years ago has been disappointing.
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.