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Reminds me of this fine old chestnut, which I shall post regardless of how many times it's been posted before. 'Cos it's great.

It's funny how quickly a lot of "multiverse" believers retreat from the idea when they are asked about the very least, the most likely, consequence of it. After all, if there are infinite universes, where everything is possible and everything has happened an infinite number of times with an infinite number of variations, is it not possible that WE live in the singular unique universe where no planes hit the World Trade Center?
The answer is nearly always no. I agree.
But there may be infinite universes. It is what the scientific data pointed toward not very long ago, and probably still does. Conciously travelling between universes to learn stuff, then coming back in order to use that knowledge here, seems unlikely, though. Especially since the best the masters of this discipline have managed so far is to build a website advertising their services.