Is our universe unique? From science fiction to science fact, there is a proposal out there that suggests that there could be other universes besides our own, where all the choices you made in this life played out in alternate realities. So, instead of turning down that job offer that took you from the United States to China, the alternate universe would show the outcome if you decided to venture to Asia instead.
If our Universe is unique - this is not a question for natural sciences, but more to philosophy. Mathematical structures, such as described by string theory, provide the possibility of a multiverse interpretation of our world, but these theories for now can neither be proved, nor, more importantly, disproved. Most importantly, the parallel universes cannot interact between each other, which makes the discussion a bit pointless.
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