from http://en.wikipedia.org/wiki/Quantum_entanglement" [Broken] so far so good. makes sense. the maximum number of mismatches (between A and C) can only be (1/100) + (1/100) = 2% yet in Quantum Entanglement (QE) the number of mismatches is, say, = 4% however if there were hidden variables (in QE) the mismatch rate would be only 2% as calculated above. thus the hidden variable hypothesis weakens. This is a chance for folks like me to understand it better. i thought the spin value is plus 1/2 or minus 1/2. how is another value possible? Let's assume x-axis. We measure spin at 0 degrees, 40 degrees and 80 degrees say.....we can only get -1/2 or +1/2 how are other values possible? what does the above mean? between entangled photons: is the correlation not the same in all directions? does only one direction, generally, have 100% correlation? what would be the actual (relative) value of the angle where A and B would be 99% correlated? however can we entangle photons such that say along both x-axis and y-axis (separately) the correlation (between entangled photons) is 100%? . Why does the correlation drop from 100% to 99%? so say at some angle (and we call it 0 degrees) along some axis there is 100% correlation but as we change the angle the correlation drops? why? anything to do with Malus law? also here we have considered only one axis. if the correlation between two photons along, say x-axis, was 100%, what correlation can we expect along y and z axis? this is conceptually understandable from the statistical coin-flips example above.