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There's a lot more background here : https://en.wikipedia.org/wiki/Many-worlds_interpretation It's not meant to be taken literally - no one thinks the universe really copies itself, when the wave function collapses. It is exactly a thought experiment - of a similar kind to the ones which lead Einstein to relativity. Doesn't make it right or wrong. However, my guess is that we WILL need to have new ways of thinking about events and time, if we are to ever understand quantum reality.