Remote-control cars, normally the toy of choice for teens, has — thanks to Traxxas — just became a lot more grown up.  And the Traxxas XO-1, the world’s fastest remote-control car, is definitely no toy—the 27-inch-long aluminum-framed racer accelerates from 0 to 160 k’s per hour in less than five seconds thanks to high-speed gearing and a brushless electric motor powered by lithium-ion polymer batteries. It even comes with an iPhone app and tune-up software, along with the ability to record real-time speed and RPM. Shinguards not included.