Interpretations of QM? What is nature really like?

[vanesch]

For me though there's a big leap between this and MWI. It comes from the meaning of "Universe". This word is of Greek origin, comprising Uni as in unicycle, and verse like in vice versa. It means "turned into one", which equates to "everything". So when I read "parallel universe" or "many worlds" the phrase "many everythings" jumps into my head, and I don't get off first base.

That's because you take the colloquial terminology too litterally.
In MWI, there are no "multiple worlds", there is one world (described by the unitary structure made up of the wavefunction/unitary time evolution operator), and there are observers which are states and of which there are very similar copies around, all in slightly (or seriously) different "states of experience".
So MWI should in fact be called "single world with observer experiences which make those observers think they are in a single subworld like they used to think of the entire world classically, but which are in fact different facets of the same, single quantum world" interpretation.

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