Since many observation-like events have happened and are constantly happening, Everett's model implies that there are an enormous and growing number of simultaneously existing states or "worlds".

Conclusion. The tenet of the Copenhagen Interpretation that charged particles have no material existence until they are subjected to measurement has no justification. It is based upon the false notion that if a particle has a probability distribution then it does not have a material existence.

Many-worlds interpretation David Deutsch argues that the way to understand the double-slit experiment is that in each universe the particle travels through a specific slit, but its motion is affected by the interference with particles in other universes. This creates the observable fringes.

The Copenhagen Interpretation asserts that a system is not in any of its allowable states or alternatively that it is in all of its allowable states simultaneously. Furthermore a particle does not have a trajectory involving a definite location and velocity as a function of time.