My first post! Hi there. I am definitely new to this stuff, so as basic an answer as you can provide would be much appreciated (although "basic" and QM are not necessarily friends..) Okay, so MWI hypothesizes that anything that can happen will, and that those happenings occur in parallel universes that we have no contact or communication with. I am wondering if anyone has hypothesized how communication with a parallel universe could be possible. And by "communication," I mean an actual person entering another world, either by "seeing" it for the first time, or crossing over into it. The way that I understand it, the concept of linearity prohibits this, because someone from world A cannot have an effect on any of the linear events that occur in world B. But I am wondering why not? If someone was to cross over from world A into world B, then why wouldn't their actions simply be new branches on the MWI tree? I hope I am explaining this correctly. Basically what I want to know is if contact with another universe, which exists amongst the one we are living in, is possible (or hypothesized to be possible). And if so, what is the hypothesis? Thanks!