Your dashboard speedometer shows more than velocity. That little dial also measures optimism. Speed is all about getting where we want to go, certainly, but it's also about enjoying the ride. Our hardwired impulse to pull ahead at every turn inspired the question: How can we find fresh ways to incorporate speed into our everyday lives?
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.