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I now know why you cry
(lemmy.world)
General rules:
Exceptions may be made at the discretion of the mods.
The best part about time travel is that if it's ever invented then it already has been.
The worst part about it always having been is the astronaut shooting you in the head.
Many versions of fictional time travel that allow backwards travel suggest that the travel cannot happen further back than the initial use of the time machine.
Perhaps my favorite example of this (in terms of narrative, if not logic) is a time machine that is turned on, only to immediately receive a note saying "turn it off RIGHT NOW."
It's also the worst part, every time I think I should invent time travel, I imagine people saying "you invented what? It was always around". No reason to even try.