I wrote in a similar thread that I think time travel is a freakish warp of dimensions, which I will assume involves dimensions that we can't yet recognize. Folds in time likely affect more than just the dimension of time, and as such, we may today be among time travelers who know of our existence, while they remain "non-existent" to us, since we can't recognize more than the dimensions the human race has known for millenia.
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less I say, smarter I am
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