Andrew256: Because your consciousness is contingent on a whole lot of things coming together in just the right way. To get the same you over again, you'd need to revert the state of the universe to what it was when the first you was produced. And that's not going to happen. To recreate you, we'd have to first recreate your parents, then somehow make sure that the particular combination of genes that went into making you was exactly the same, and so on and so forth. Those states might be equal as far as you are concerned, but they are not equal as far as the rest of the universe is concerned. The universe will have moved on between your pre-birth and your post-death, in such a way that the conditions that pertained during your pre-birth will never occur again. Yes. A very very high probability indeed. Not in this universe, anyway. Our universe isn't infinite in time, though, as far as we can tell. It's only 14 billion years old now, and it won't last forever (at least not with conditions suitable for producing life).