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The branch of thought that asks what it means to exist in a universe where past, present, and future are equally real, and your sense of "now" is just a local illusion. If all moments exist simultaneously, are you still responsible for past mistakes? Can you change the future if it already exists somewhere? And if time is just another dimension, is death just a rotation into a direction you can't perceive? Spacetime philosophy is the art of making Einstein's theories even more existentially confusing, transforming physics into questions about fate, free will, and whether you should have had that third cup of coffee.
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