String Theory proposes the existence of other universes. If another Universe is defined by everything we can't observe and/or detect in our Universe, does that make empty space itself one of those other Universes? Other than emptiness, we don't observe anything in empty space. Does that mean part of another universe could be right in front of our face instead of beyond the outer edges of our observed Universe but we are just unable to detect it? Do quantum particles fall in and out of Multiverses, appearing and disappearing seemingly randomly between the Multiverses, one being ours? Is that why quantum particles are so strange to us? Because we haven't realized their values are either fluctuating between or satisfying the physics of two different Multiverses at once?