The Boltzmann Brain

What is more likely: that a full universe evolved over 13.8 billion years, or that a single conscious brain randomly fluctuated into existence from chaos?

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Statistically, a Boltzmann Brain

The answer to this riddle is Statistically, a Boltzmann Brain. Difficulty: Hard · Solved by 10,888 puzzle lovers.

Statistically, a Boltzmann Brain is more likely in an infinite universe, which is a problem for cosmology. This suggests our understanding of probability or cosmology is incomplete.

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