Swap one electron for another, and you won't be able to tell That there exists only one electron, and that electron traverses time in both directions. This theory states that every electron in the universe is actually one particle that continually travels backward and forward through time.
What if every electron in the universe is actually the exact same electron This principle states that no two identical fermions can occupy the same quantum state simultaneously. Electrons and positrons, wheeler suggested, are actually a single entity moving forwards and backwards in time.
According to our current understanding of physics, each electron in the universe is indistinguishable from one another Electrons are elementary particles, and they belong to a class of particles called fermions, which obey the pauli exclusion principle
