[AgentME]

Certain experiments have shown that quantum mechanics is incompatible with local realism, and this means either that locality is wrong, and the world has faster-than-light communication, or that realism is wrong, and that there are no single outcomes to events. Assuming that locality is true and realism is wrong, when you measure particle 1, it's not that the result is being instantly communicated to particle 2 and causing it to come out that way, but all possible outcomes for each particle measurement happen separately, and all versions of things affected by particle 1's measurement only interact with versions of the world where particle 2 has or will have a compatible measurement. No collapse ever happens, though from each of the perspectives of humans inside the superposition, they will see results that look like their own measurement caused a collapse, because they each will eventually see a single consistent outcome for the results of the particles' spins.

The results of nonlocal and nonrealism theories come out the same, though nonlocal theories imply a lot of mysteries around the contradiction between instant communication and relativity of simultaneity, while nonrealism just paints a picture of a MWI universe that's surprisingly larger than our expectations.