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Uploaded on Apr 20, 2011
Prof. W.G.Unruh lecture on Feb 2005 at Green College, UBC, part of PITP Lectures on Quantum Phenomena. Summary: Since the Proof of Bell's theorem in the 1960's the impression has grown that it implies that quantum mechanics is a non-local theory, and even people who should know better talk about quantum mechanics as if it is non-local. I will review some of the issues, and try to make as good a case as I can for its non-locality, but ultimately argue that it is a local theory. But along the way many of the most unusual features of quantum mechanics will be reviewed, and some philosophical issues regarding counterfactual reasoning will be discussed.