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RE: How Alternate Timelines Solve The Grandfather Paradox of Time Travel
Wasn't it Einstein (r at least his wife), that said all time happens simultaneously?
If so then we only need to find the portal or wormhole.
Yes, wormholes are another possibility, though one has never been observed before. But since the math allows for it, it should exist. It will be very exciting if and when we do finally observe one.