User blog comment:NovaSims/The Multiverse/@comment-24564179-20120516164833/@comment-3967693-20120522200201

@David: While it might be possible, that's extremely unlikely. Considering:

1) Universal laws, atomic structure, etc. will probably need to be exact same as our own universe in that other universe 2) That other universe version of Earth would need to be precisely at the same distance as our universe 3) The same events that created life (cells, multicellular organisms) in the first place (right temperatures, water occurring on earth, magnetic field, atmosphere) would need to be present 4) Evolution (that is said to have made humans who we are) would need to go the exact same route, with the same events and the same disasters occurring to ensure that we're made 5) Alternate universe humans, even if they existed, would have to have similar if not the same religious beliefs 6) Hitler would have to be born with the same parents, with them having conceived him at the right time at the right place, but their religious beliefs could influence them to live elsewhere, do to something else, and they might never meet in the first place.

Not to be the bearer of bad news, but all of those happening in another universe the same route that happened here is probably close to impossible. Sure, life might exist that comes close, but I doubt we could ever find alternate versions of ourselves.