Alternative Realities: Physics Project Help

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i have to do a project on alternative realities for my physics final. I've struggled all terma nd i don't fully understand and when searching google i keep getting results for a game. can someone please explain what an alternative reality i or some other ideas what to search for?
 
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I think they mean parallel universes by it.

http://en.wikipedia.org/wiki/Multiverse_%28science%29"
 
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multiverse as suggested previously
(string theory) landscape
alternative universe
quantum mechanics
 

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