Well, all my thoughts on parallel universes I got either from this thread or from Star Trek, so you all can totally ignore me if you like.
Parallel universes, to my mind, would "branch off" from this universe whenever any sort of choice is made. For every possible thing that could happen, there would be a parallel universe in which it did happen. Some would be almost identical to our universe, distinguished only by a small detail, while others would be totally different.
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