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I remember an article years ago in Popular Mechanics about an antigravity device that reduced gravity above the spot where the device was tested by spinning a ceramic magnet disc over a superconductor coil.
The interesting thing that they found was that, in addition to reducing gravity immediately above the device, it effectively "blocked" part of the earth's gravitational pull in a column dircetly above the device as high as they could measure.
Another interesting effect was that the effect could be multiplied by stacking more then one of the devices.
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