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The Boltzmann Brains
If the universe goes on forever, then all kinds of combinations of fundamental particles that are in the universe should happen at some point. Provided the loss of nature for fill a certain property, which is called agotic,. Then it can happen that just coincidentally, the elementary particles combine to form some particular molecule and it takes a really long time. And if you wait long enough, it would form a brain. But the downside of this is that the larger the thing, the shorter it will persist because it's surrounded by all this randomness. So the shorter the thing lives, the more likely it is. This is what gives rise to this idea of the Boltzmann brains.