How the Air Car Works

As gasoline continues to lose its cachet as a reliable energy source, auto manufacturers have started to turn toward cleaner-burning fuels. However, they're still trying to figure out how to use the cleanest fuel of all -- the air we breathe.

The search is on, but what will this fuel of the future be? Ready-made fuels like petroleum are becoming more difficult to find and automobile… » Full Story on HowStuffWorks