Quantum Many-Worlds

In 1957, physicist Hugh Everett proposed the most mind-bending interpretation of quantum mechanics: every time a quantum measurement occurs, the universe splits.

A radioactive atom has a 50/50 chance of decaying in the next hour. In Everett's framework, the universe splits — one branch where it decayed, one where it did not. This branching happens for every quantum event, creating an exponentially growing tree of parallel realities.