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One might consider the results of placing such a substance under one-half of a wheel on a shaft. The side of the wheel above the substance would have no weight, while the other side would. This would cause the wheel to continually "fall" toward the side above the plate. This motion could be harnessed to produce power for free, a clear violation of the first law of thermodynamics. More generally, it follows from Gauss's law that static inverse-square fields (such as Earth's gravitational field) cannot be blocked (magnetism is static, but is inverse-cube). Under general relativity, the entire concept is something of a non-sequitur.

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