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QM says an electron takes "all possible paths"(Feynman)from emitter to detector. What does that mean? Clearly some paths are much longer than other paths. If the electron is traveling as wave, I can see how it would "spread out" in space. I assume the electron "collapses" to a particle when the wave front reaches the detector, but what about the rest of the wave that is spread out in space? Does it just disappear? How does the wave "know" that a tiny part of its wave front intersected a detector? What if there were more than one detector, each precisely equidistant from the emitter? Does the wave "choose" where to collapse. Can it collapse at two or more places at once?