  In papers published in the 25 years following his famous 1964 proof John Bell
refined and reformulated his views on locality and causality. Although his
formulations of local causality were in terms of probability, he had little to
say about that notion. But assumptions about probability are implicit in his
arguments and conclusions. Probability does not conform to these assumptions
when quantum mechanics is applied to account for the particular correlations
Bell argues are locally inexplicable. This account involves no superluminal
action and there is even a sense in which it is local, but it is in tension
with the requirement that the direct causes and effects of events are nearby.
