How is "a particle that interacts with particles in parallel universes" any simpler? That sounds like a crazy special rule. Why and how do individual photons/pa

How is "a particle that interacts with particles in parallel universes" any simpler? That sounds like a crazy special rule. Why and how do individual photons/particles interact with parallel universes when nothing else can do so? Honestly, MWI sounds to me like just a fancy way of saying "magic".