This is a spin-off from the thread on Bell's theorem, following this post: https://www.physicsforums.com/showthread.php?p=3819552 Instead of discussing about λ and the way to account for it, Nick Herbert seems to have provided a stunningly simple and convincing proof of "quantum non-locality" here (thanks for the link Lugita15): - http://quantumtantra.com/bell2.html The essential part is in the last drawing, with the text just above it: simple arithmetic and the assumption that Reality is Local leads one to confidently predict that the code mismatch at 60 degrees must be less than 50%. It surely looks very convincing to me! :tongue2: Thus my questions: - are there known issues with that proof? - I thought that models exist that reproduce the characteristic of QM of a greater "mismatch". However, according to Herbert's proof, that is not possible. What's going on?