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There is still much confusion about quantum theory. I believe that the origin of the confusion is due to the mistake of taking the quantum state (the wave function) as a description of how things *are*, instead of what it really is: a way of coding quantum events and a devise for predicting future ones. The mistake of interpreting the state realistically leads to the apparent mysteries of the “measurement problem”, and the “collapse of the wave function”, and to misunderstanding what quantum theory is actually telling us about the world; namely that in the real world there are less real events than in classical mechanics, and that there is an essential discreteness in nature: there is only one distinguishable states per Planck volume in phase space, and not an infinite number, as in classical theory.