  The curious EPR/B correlations strongly suggest the existence of non-local influences between the two measurement events, and indeed orthodox ‘collapse’ quantum mechanics supports this suggestion. According to this theory, before the measurements the particles do not have any definite spin. The particles come to possess a definite spin only with the first spin measurement, and the outcome of this measurement is a matter of chance. If, for example, the first measurement is a z-spin measurement on the L-particle, the L-particle will spin either clockwise or anti-clockwise about the z-axis with equal chance. And the outcome of the L-measurement causes an instantaneous change in the spin properties of the distant R-particle. If the L-particle spins clockwise (anti-clockwise) about the z-axis, the R-particle will instantly spin anti-clockwise (clockwise) about the same axis. (It is common to call spins in opposite directions ‘spin up’ and ‘spin down,’ where by convention a clockwise spinning may be called ‘spin up’ and anti-clockwise spinning may be called ‘spin down.’)