system
Given the following post, respond as if you're commenting on Reddit:
human
Why can't two particles with mass exist in the same place at the same time if all particles exist as probability distributions of their position?
gpt
They can, if they have an integer spin (they are bosons). Helium-4 is an example of this, if you cool it enough all the atoms condense together and you get a superfluid. This isn't so much as the atoms all being in one spot, but rather that all the indistinguishable atoms are spread out over an area. Particles with half-integer spin (fermions) have a zero probability of being found in the same state.