If you were given the Jeopardy! category "things that breathe," chances are your answer might be, "What are living creatures?" Chances are also high that your answer would not be, "What is a battery?" You'd now be wrong.

Batman, being Batman, probably has no need for a race car from Nissan. But if he did need a race car from Nissan, he'd probably have Bruce Wayne go and buy the DeltaWing, an entirely new take on IndyCar and LeMans racers.

Unless you live in a fantastic and coordinated city like Portland, Oregon, you're likely familiar with the phenomenon of idiotic traffic lights that conspire to turn red just as you approach to make way for zero cars coming the other way. It's not just annoying, it's also bad for the ol' environment, and intelligent traffic lights could make a big difference.

MIT has been working on their clever little foldable, stackable City Car concept for nearly half a decade now, and they've finally made a real one. It's destined for Europe in 2013, but not for individuals: to drive one, you'll have to be willing to share.