Quote:
Originally Posted by Sethomas
If someone went back in time to alter the past then we'd know about it from the past. Hence, if you wanted to destroy the universe with the grandfather paradox, you'd be wise to ask your grandfather if he remembers any strange encounters with someone resembling yourself. If he says "no", then it's obvious that you will never undertake a mission to the past that involves him, so you fail. If he says "yeah, I kicked his fucking ass and then he died", then you will have the interesting experience of living out the rest of your days with the known and immutable fate of getting killed by your grandfather with all imagined conceptions of free will being shattered.
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This is what's interesting about the "going back in time to kill your parent/grandparent/etc." paradox. Even if time travel were possible killing an ancestor would be impossible because it would have had already happened, but it couldn't have happened because the killer would never have been born
So if any of you guys plan on going back in time and killing your deadbeat father don't bother because you obviously must have done it wrong already.