Hmmm let me think??? I have a piece of string its not a theory. It's here in my hand! Look I've tied a knot in it and everything
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Well with regard to time travel, it appears that the fabric of spacetime in our universe (outside of a black hole) points only in one direction. Very strange things happen when you're within the horizon of a black hole itself, time and spatial coordinates "switch" and once within the horizon you will always be pulled into the singularity. I can't really elaborate any further because I did rather poorly in General Relativity. I actually had one professor, unbelievably brilliant, who not only doesn't follow String Theory, but shuns Quantum Mechanics. He actually has been able to resolve a fair deal of paradoxes that arise within classical physics.
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