[SOLVED] A Solution to the Grandfather Paradox For those who don't have a clue of what the grandfather paradox is, here is the definition: Okay, so my solution: My solution is enitirely based on Richard Feymann's multiple history idea. [Removed Broken Link] [quote][b] This idea implies that there are multiple histories. For each decision that is ever made, (i.e. should I wear a white shirt or a black shirt today) there is another universe in which the decision is made differently. It is possible that in another universe, you wear a white shirt every single day of your life. This idea, however, is very difficult to prove. By definition, it would be impossible for us to go to these other universes and see for ourselves. Feynman histories allow for closed-loop time as well as spacetimes which are warped enough for travel into the past. Keep in mind that we are talking about really small particles here, not spaceships or even people. As Hawkings points out, due to these quantum fluctuations in spactime "quantum theory allows time travel on a microscopic scale" (p. 150). We cannot talk to hydrogen atoms and ask them if they travel in closed loop histories, but we can observe that there is a shift in the light given off by hydrogen atoms, which indicates that their electrons are moving in closed loops. Maybe, time travel takes place in front of us everyday according to Feynman histories, yet it happens on such a small scale that we don't even notice it. [/quote][/b] So, you go to the past, kill your grandfather. This automatically creates a new history. (sort of like a branch, so to speak)You would still be in existence in the original history, but not in the new one. This causes me to ask, can you exist twice? If your grandfather's twin becomes your grandfather, would you still be the same person(genetically speaking, and not refering to personality traits, as that gets quite a bit complicated)?