As if quantum theory didn’t already have enough problems, there is another elephant in the room. Quantum theory leaves one remarkable interaction of nature completely unexplained: gravity. Since gravity is rather weak at the scale of particles, it doesn’t affect the results of experiments in the lab. A comprehensive theory of particles should account for gravity, but the current best theory doesn’t. Instead, gravity is explained by a separate theory, Einstein’s general theory of relativity. This theory is, unfortunately, incompatible with quantum theory; quantum theory does not account for the
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