It's a dream come true for middle-age kids everywhere. Mattel has produced a life-size version of its original Hot Wheels car, 1969's
Twin Mill. Powered by two Chevy 502 big blocks, the real Twin
Mill reportedly spits out more than 1,400 horses. And while it's fully driveable, it's built to be shown off at auto shows and races, not on the street. And no, it's not for sale.
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.