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WillyPete, that's the main problem with the Multi-Verse idea - do all those other universes ACTUALLY exist physically somewhere? Or is it just a mental trick to help avoid the breakdown of one of those 4 'comfortable' tenets.
Remember, Time, which we used to have listed as the 5th one of those tenets (a mental foundation on which we base much of our 'understanding' of the universe around us) got utterly trashed by Einsten around 100 years ago or so.
Before time, it was the laws of gravity and motion (we thought that things just 'liked' being on the earth), and before that, we thought that the Earth was at the centre of the universe, and all the stars, the sun, the moon and all the planets whirled round us on a complicated series of inter-connecting spheres.
It looks to me as though there is a pattern of breaking down these common sense assumptions we make about the universe, and that imaginative attempts at preserving them (while entertaining) are unlikely to provide any real description of the underlying structure of the universe. (Just my humble opinion)
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