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One thing the antigravity folk have not noticed is that their discovery gives them a perpetual motion device as well as a means for space travel. Yes, it gives us free energy, in unlimited quantities. For it is only necessary to put a wheel, like a Ferris wheel, over the superconducting disk (or coil). If you locate it so that half the wheel is over the disk and half is to the side, then half the wheel will be lighter than the other half. Then this will truly be an unbalanced wheel and will turn endlessly, driving a generator and giving an endless source of mechanical or electrical energy, which, of course, is impossible.