One easy thing to do is to make airplanes more aerodynamic so that they do not have to use as much energy to push through the air. In fact, aerodynamics can be used to make any vehicle more efficient. What happens is that engineers sit around and test different shapes in a wind tunnel to see how well they work or use computer models as a substitute for a wind tunnel. Professional cyclists like Lance Armstrong also use wind tunnels to figure out the most aerodynamic riding position for their bodies.
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