This thing is a mess. But no matter what I do, there I am, so...there it is. Desk cleared. Back to writing. P.S.: Too long, don’t watch. Unless you want to know the actual reason why you too have always hated movies that take time travel seriously. (And yes, Avengers: Endgame took it seriously; they merely put a frame around the absurdity before adopting it as the solution to the insoluble problem of Avengers: Infinity War.) N.B.: This is not about the grandfather paradox, or other such causal loopiness. Theoretical physics isn’t troubled by paradoxes. And it shouldn’t be, really, since a paradox is only an apparent contradiction. An actual contradiction, e.g., “The cat is both dead and alive," is much more problematic. (Anyone who claims that cat presents a mere "paradox" has missed the point of that thought-experiment.) And actual contradictions are still disallowed -- in math, logic, even in physics -- which means that a theory, or an interpretation of a theory, which results in an actual contradiction probably needs a little more work. Ask the guy whose cat that was. Most theoretical types out there today "deal" with that troublesome cat either by trying to make him go away or by pretending he's irrelevant. But in the humble opinion of this semi-educated observer, in the case of block time, the contradictory cat is back. And in this case, and again IMVHO, I don’t think he can be ignored.