Hello all, When I read the original papers by EPR and Bell here http://www.drchinese.com/David/EPR_Bell_Aspect.htm I didn't understand them. But I found a paper that explains Bell's theorem quite good: Daniel M. Greenberger, Michael A. Horne, Abner Shimony, Anton Zeilinger "Bell's theorem without inequalities", American Journal of Physics Vol. 58 (12), December 1990. So for all the ones who are interested in Bell's theorem, read the paper! Especially the Appendix, where Bell's inquality is derived. If you know of any other good papers on this topic, just post them here. Cheers! Edgardo P.S. To find the paper, type in google American Journal of Physics and Browse "All Online Issues" http://scitation.aip.org/dbt/dbt.jsp?KEY=AJPIAS Go to Volume 58, to December and search for the title.