Even though you'll park it IN your garage, drive it to your nearest airstrip, and pilot it to your destination, don't think of the Transition as a flying car. Carl Dietrich, the MIT aeronautical-engineering graduate student who is designing the vehicle, prefers the term "roadable aircraft"meaning a plane that drives, not a car that flies. "We try to steer away from The Jetsons," Dietrich says. "It's a step in that direction, but a baby step."

Dept.:You built what?! Tech.: World´s fastest human-powered vehicleTime: 200 hours Cost: $15,000Practical | | | | | Popcorn