many worlds
branch · diverge · persist
Physicist Hugh Everett proposed in 1957 that quantum outcomes never really collapse to just one result. Instead, every possible outcome happens — reality splits into separate branches, each one just as real as the others, each with its own version of you who sees a different result and has no idea the other branches exist.
The math treats every branch the same way, with no favorites. What it can't explain is why your experience follows just one branch instead of all of them. Many-worlds gets rid of the mysterious "collapse," but it leaves behind a stranger question: not which outcome happens, but who ends up experiencing it.