The Boltzmann brain argument suggests that it is more likely for a single brain to spontaneously and briefly form in a void (complete with a memory of having existed in our universe) than it is for the universe to have come about as the result of a random fluctuation in a universe in thermal equilibrium. It was first proposed as a reductio ad absurdum response to Ludwig Boltzmann's early explanation for the low-entropy state of our universe.

[en.wikipedia.org]

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