M-Theory states that there are an infanite amount of other realities

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The multiverse theory states that there are an infanite amount of other realities, and that anything that can happen will hapen. How does this really work?
 
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It is a purely theoretical proposition. There is no known way to observe the consequences of other universes from this universe. It is irrelevant until demonstrated necessary to explain some observation, or class of observations.
 
Ultrastar, I guess you are confusing "M-Theory" which is related to String Theory (see e.g. http://www.damtp.cam.ac.uk/research/gr/public/qg_ss.html) with "MWI" (Many Worlds Interpretation).
 

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