Your Car 2022     The automobile has been on the verge of being reinvented practically  since it was invented. Cars that would float and fly, cars that would  walk, cars that would cruise like bubble-shaped VIP lounges: Surely a  brand-new car was right around the corner, or at least a couple of years  away. Problem was, the irreducible requirements of engine,  transmission, suspension, and fuel tank, and all the mechanical linkages  involved (pedal to throttle, driveshaft to wheels), dictated much about  not only how a car would function, but how it would look.    Finally, however, more than a century after cars appeared, two things  make possible a radical liberation from the dictates of traditional car  design: drive-by-wire, and power from fuel cells. These technologies are  not fully realized, but the huge opportunities they present are  beginning to inform automakers' plans.    General Motors appears to be in the lead, or at least is the most vocal  ...