According to the Many-Worlds Interpretation, every time a quantum event occurs, the universe splits into multiple parallel universes, each with its own version of history.
Or, you know, it's just a bunch of cats in a box.
But seriously, this theory has some pretty wild implications for our understanding of reality. Like, did you know there's a universe where the chicken is the dominant species and we're just their food source?
Want to see for yourself? Visit our Many-Worlds-Parallel-Universes subpage for more information.