Icarus gave a splendid explanation of the collapsing wave principle.
The attraction of this and the subsequent many worlds theory (Everett, and the rest) is that it can make possible virtually all of the myths and legends of all religions and philosophies, including ghosts, past lives et al.
The two debates going on here are actually quite seperate (and I may have been responsible for a sidetrack) but as I detected a hint of sarcasm from more formally trained contributors, they would do well to remember that the basis of their chemistry is quantum mechanics!