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.
I find the video at the link below to be very helpful in providing a way to imagine how the different parallel universes for our own universe, and the "omniverse" of multiverses created by other universes with different basic physical laws, could all be just as real as the version of the universe I am within at this very moment. This video gives me a logically consistent way to stack all of those ideas on top of each other: http://www.tenthdimension.com/medialinks.php
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