Everett’s interpretation of quantum mechanics [1] is a more compelling and in my opinion a framework more faithful to the principles of physics than Copenhagen.

The Copenhagen interpretation introduces a wave function collapse which, aside from placing an unnatural emphasis on the observer, also introduces an arrow of time where the Schrödinger equation is symmetric in time. It’s a weird and unintuitive crutch bolted on.

Oddly enough, Everett’s interpretation implies the past is as uncertain as the future. At a “fixed moment” there’s a branching where the system continues forward in time as concurrent “worlds” but also the same is true in reverse. Going backwards there were many branches that merged at that point and then branched again.

What does that imply for us? On the macroscopic scale we don’t know, but one possibility is the idea of confluence. Basically at the smallest scales of the universe we have these parallel quantum systems but for every branching there’s a corresponding merging eventually and at the larger scales all we are capable of observing are the states that are consistent between each of the parallel systems.

1. https://en.m.wikipedia.org/wiki/Many-worlds_interpretation