Will cars of the future run on liquid nitrogen?

With all the hype surrounding electric cars and hydrogen-powered fuel-cells, it's easy to think hydrogen is the future of automobiles. But as people start developing and popularizing these enviro-friendly cars, some problems are becoming apparent. And meanwhile, there's a new kid on the block that is threatening to… » 10/18/12 11:30am 10/18/12 11:30am