The Many-Worlds Interpretation (MWI) is a speculative interpretation of quantum mechanics that suggests the existence of multiple parallel universes or "worlds." According to this interpretation, whenever a quantum measurement or interaction occurs, the universe branches into multiple parallel realities, each representing a different outcome of that measurement.
In the Many-Worlds Interpretation, every possible outcome of a quantum event is considered to have occurred in a separate branch of reality. This implies that every conceivable outcome, within the bounds of quantum mechanics, has indeed happened somewhere in the multiverse.
However, it is important to note that the Many-Worlds Interpretation is just one of several interpretations of quantum mechanics, and its claims about the existence of parallel universes are speculative and currently unverifiable. The idea of multiple universes is a subject of active research and debate among physicists and philosophers, and it has not been conclusively confirmed or disproven.
It is also worth mentioning that the Many-Worlds Interpretation does not imply that every physically possible event has occurred somewhere in the multiverse. Feasibility and physical possibility are not necessarily equivalent. Some events might be physically impossible even within the framework of quantum mechanics, and therefore, they would not occur in any branch of the Many-Worlds Interpretation or any other interpretation of quantum mechanics.
Overall, while the Many-Worlds Interpretation suggests the existence of multiple parallel universes, the specifics and extent of those universes and the events occurring within them remain highly speculative and subject to ongoing scientific investigation.