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I voted Aliens/Parallel universes/Time travel
However I must add that I'm not sure about the parallel universes, since science hasn't yet proven nor disproved their existence yet, as far as I know.
Time travel: I think it might be possible in the future but I'm not sure, anyway we all travel in time but only forward in not back.
And it's very likely that aliens exist, because the universe is so vast.
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