The problem that I find with this theory is that each of these universes would have to be unique from every other one, right? So the laws of physics in each universe have to be different than all of the other universe's laws of physics. Otherwise, the atoms in one universe would follow the exact same laws as they would in another, and therefore all move to the same place at the same time as they would in another universe, meaning that the two universes in question would be identical. But if the laws of physics in each universe are different, then that would make each universe have its own system of logic as well. For example, in one universe, one cookie plus one cookie may equal five cookies, and 1+1=2 wouldn't make any sense. It is hard to imagine, but in theory, every one of these universes would have to have logic that works slightly differently than ours, or our universe and their universe would be identical down to the slightest detail. However, I can't imagine how a human being, which lives based off of a certain set of physics and logic, could even exist in another universe. We basically wouldn't be compatible.