I think that you have to apply plenty of irrational logic to ideas such as parrelel universes (the fifth dimension), time travel et al.
I cannot understand how eminent thinkers none less than the Lucasian Professor of Astrophysics at the University of Cambridge Stephen Hawking promote such proposterous ideas as time travel. How could it be possible to replace 'every single particle in the universe to a previous state and exact place'. The simple answer it isn't and books on the subject should go into the science-fiction section.
I won't elaborate on my equally sceptical view of a parrelel universe other than to say when I went to a seminar on this while I was a student at Oxford the speaker opened up with the line "Just imagine Elvis is alive and well in a parrelel universe to ours somewhere......."
Nuff said.
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