Parallel universes DO exist - and they interact, theory suggests

Imagine a world where dinosaurs hadn't become extinct, Germany had won World War II and you were born in an entirely different country. These worlds could exist today in parallel universes, which constantly interact with each other, according to a group of US and Australian researchers. It may sound like science fiction, but the new theory could resolve some of the irregularities in quantum mechanics that have baffled scientists for centuries.