I’ve tried and tried to understand it but there so much to follow, I can’t grasp it in its entirety.
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It’s just a brain produced by something random; usually quantum fluctuations or “nucleation,” depending on what “kind” of universe we really live in (i.e., the true fundamental properties of the universe).
But other than that, it’s literally just a brain. The problem is: how do we know we’re “real” humans versus just a brain that spontaneously assembled?
If the universe exists for infinite time and under certain circumstances, there would be infinite Boltzmann brains. So the probability you’re an actual human is basically 0: you’re probably a Boltzmann brain with spontaneous memories of being a human.
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