The EPR paradox

Colin Jack is to be complimented on his entertaining exposition of the Einstein-Podolsky-Rosen paradox in "Sherlock Holmes investigates the EPR paradox" (April pp39–42), but the more serious explanation he gives is misleading in an important respect. There is, and need be, no "influence" travelling from one detector to the other. Although the results of the measurements are correlated, it is a logical fallacy to suppose that a correlation has to imply a causal connection.