"I've wondered that too, after hearing stories from people here who came from later in my world than I did. But, you know Jim Kirk? He explained some of it to me. If what he said is true, then there can be different versions of the same place that exist side by side, but never actually interact. Like they travel down roads next to each other but there's a wall in between. When you make a big change in your world, another road forks off. So anything we fix makes a new road with the consequences of that fix, and that's the world we live in, but the other worlds don't stop existing."

A system that, if true, makes for an awful lot of these side-by-side worlds. Can the universe actually hold such a huge system? It's hard to know how much of it to believe, but then again, how can he say he knows any better than Jim? He can't just reject something because it's a new idea that he doesn't fully comprehend.