You gotta admit the 5th Dimension had a great sound back in the 60's. Sorry, I couldn't resist. With regard to time travel, how do we know it is not possible to travel through time? We discover new things all the time. One day flight was impossible. Then in 1903 it was shown to be possible. Now we all fly. It is that nagging problem that we don't know until we know. We also can't know what we don't know. With the Block Universe Theory (all things exist in space-time and passing of time is an illusion) time travel should be possible, in theory.
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