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Do you believe in multiple dimensions and, if so, do you believe inter-dimensional travel is possible?

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Kaluza and Klein theorized a fifth dimension in 1921 to unify gravity with electromagnetic force, as a means toward trying to find the Universal Field Theory.
Klein thought the fifth dimension would be rolled up into a tiny, compact loop of one 33 billionth of a centimetre, hence too small to be detected.

I somehow think it would be rather tricky to travel in this dimension.