> If you stir a glass of water, the theorem guarantees that there absolutely must be one particle of water that will end up in the same place it started from.

> If you stir a glass of water, the theorem guarantees that there absolutely must be one particle of water that will end up in the same place it started from. Wait what? If you stir a glass long enough, any configuration of particles should be possible. For instance you can imagine "cutting" the water like a deck of cards.