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ok, heres one for you. take a model car, with wheels that roll, put it on a treadmill. theres no real engine in it to drive the WHEELS, so you have to push it with your hand to make it move forward on the treadmill. same concept as jet engines on a plane, they will push the plane forward, because the wheels are rolling free underneath the plane.
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Matt
B18B1 FTW
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