source = http://scienceblogs.com/principles/2012/03/14/entanglement-is-not-that-magic/ It's not clear to me from the above whether this experiment is repeated on the same entangled pair of photons, or a different pair each time. Also, thanks to SR, I have trouble with the "when." Would the following correctly paraphrase the above? Particles are considered entangled if we know how to correlate their measurements, and not if we don't. In other words, there is still/always a correlation, we just don't know what it is.