Let any one try to account for this [probabilistic] operation of the mind upon any of the received systems of philosophy, and he will be sensible of the difficulty. For my part, I shall think it sufficient, if the present hints excite the curiosity of philosophers, and make them sensible how defective all common theories are in treating of such curious and such sublime subjects.' David Hume [1]. When you come to a fork in the road, take it. Lawrence Peter ("Yogi") Berra Probabilities make just

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... s much sense if all possible results occur as if just one does. David Papineau [2]. Abstract From its first significant appearance in physics, the notion of probability has been linked in the minds of physicists with the notion of uncertainty. But the link may prove to be tenuous, if quantum mechanics, construed in terms of the Everett interpretation, is anything to go by.