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there's also the thought (albeit apparent in some fictional books) that time travel creates bifurcations if you would travel in the past (i.e. a bifurcation is a split in the timeline, so if you went back and altered something you've essentially created an entire new timeline parallel to the original..)
but going into the future and coming back ahead of $depature_time would still be worthwhile i think. and it wouldn't ruin anything since the future is not decided (and if you traveled back to anything ahead of $departure_time, you couldn't create a bifurcation either.)
however, i do think we'd know about it, unless in the future they have time travel rules, and one of them is to be completely benign in past societies..
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