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originally posted by: Blue Shift
Just wanted to add that time travel is "personal." Time is only perceived on an individual level, and there is no such thing as "objective time." So if you go back to the past you will still remember the other life you already lived in the same years numbered out after your arrival in the past. But as far as the non-traveling people are concerned, nothing has changed for them.
If you killed your grandfather before your father was born, you'd just continue to live out your life remembering your grandfather and father, but now you'd also remember killing Gramps and what came after that. If you pulled a Marty McFly and went "Back to the Future," you'd still be alive, but it would seem that you appeared out of nowhere, and there would be no record of you.
You'd be like that stranded dude from Taured. But the point is that nothing changed because none of the stuff you did in the first life ever happened. There being no record of you isn't a change. That's the way it always was. Your future is always exclusively yours.
originally posted by: ginseng23
Back to the main idea, the notion of paradox:
I am not exactly sure quite yet, I will have to run some scenarios in my head.
You all bring fascinating points. Please don't be afraid to critique or call out logical fallacies, as this aids in progression.