Superposition. In the same way Schrodinger’s cat can be dead and alive at the same time - can multiple universes coexist? Some top physicists in this field give their view - and do some ice skating and rock climbing at the same time. playlist link www.youtube.com ... bbc horizon parallel universe omniverse multiverse superposition schrodinger cat quantum theory mechanics physics string many worlds david deutsch brian greene ed witten m-theory lisa randall gravity dimenesion membrane brane ...