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https://twitter.com/blackphysicists/status/18088038311884431912. A superconductor is a perfect electrical conductor, where direct current flows continuously with no energy loss through heat or sound. A superconductor is a perfect diamagnetic material. Since most things in nature are not perfectly diamagnetic gravity appears in reality.
https://twitter.com/BrianRoemmele/status/1786888668512481445