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Quantum theory is so queer that physicists resort to one or another paradoxical "interpretation" of it. Resort is the right word. David Deutschi, in The Fabric of Reality, embraces the 'many worlds' interpretation of quantum theory, perhaps because the worst that you can say of it is that it is preposterously wasteful. It postulates a vast and repidly growing number of universes, existing in parallel and mutually undetectable except through the nawwor porthole of quantum-mechanical experiments. In some of these universes I am already dead. In a small minority of them, you have a green moustache. And so on.