Suppose we have a photon fired at a half-silvered mirror. There is a 50% chance that the photon reflects, and a 50% chance it passes through, right? Suppose there are two detectors, one that only detects reflected photons and one that detects only passed photons. So my question is: does the photon take both paths? And if so, is a detection a collapse? OR: does the photon decide which path it will take? I think I am beginning to understand what the problem with QM is.