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There was a sci-fi novel I read once that featured vehicles that were basically enormous gyroscopes, riding on a single wheel. They got forward velocity by inclining the axis of the vehicle relative to the plane of the gyroscope, to produce gyroscopic precession forces to accellerate the vehicle. Pretty nifty!
Probably more than 20 years off, though. I think hybrids are the wave of the immediate future. Probably 10 years. By then we may have a battery that can last long enough to have a solely electric car (that actually has room in the trunk for something other than batteries).
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