digg_url = 'http://digg.com/general_sciences/Super_Mario_explains_parallel_universes_2'; You're unique. Aren't you? One of the more creative hypotheses surrounding quantum mechanics posits the exact opposite. Though we can readily see only one world, quantum mechanics says that when were not observing the particles that make up that world, those particles exist in multiple places at once. There are many theories that attempt to grasp what this means, but one of the most tantalizing is Hugh Everett's multiverse concept.
No in the multiverse concept the probability wave of the atom is what is what each alternate history represents, therefore before the collapse, even without a change there is still a haze of hundreds of possibilities each which would result in a different action. For example an atom has a 90% probability of being in your room and a 10% probability of being in the Andromeda galaxy, then either 10% of the universes have it in the Andromeda galaxy or when you analyze it 10 universes are created and 1 of them has that atom in the Andromeda galaxy.
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