You thought the Mini was a small car? Behold, the nanocar. Sounds a little too small for me, but it should get great mileage:

The nano-car’s molecular motor contains a pair of bonded carbon molecules that rotate in one direction if illuminated by a specific wavelength of light. After fixing the molecular engine to the car’s chassis and shining a light on it, Tour’s team confirmed that the engine was running by using nuclear magnetic resonance to monitor the position of the hydrogen atoms within it…

…Tour estimates that the car could travel two nanometres per minute but says his team has yet to find a way to watch their molecular automobile in action. “We think the car would drive along, but we wouldn’t be able to see it and I don’t think people would believe us,” he says.

You don’t say…

Even if they can get them working, I’ll bet they still can’t find a parking space in Manhattan.