By Jim Henry

High-Tech Concept Cars

Fifty years ago, General Motors called its high-tech concept cars "Dream Cars." Most of them, like a turbine-powered car that looked like a jet airplane, remained just that—a dream. Today's high-tech dream cars are rooted in much more practical concerns, especially fuel efficiency and weight savings, which were not on the pop-culture radar in the 1950s. Today's concept cars are much closer to making dreams like fuel cells, which generate electricity from hydrogen and emit only water vapor, come true.

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