Physics aspires to a sort of universality that is unique among empirical sciences and holds, in that sense, a foundational position among them. - Tim Maudlin

Perhaps the most vexing question confronting any study of Bell's inequality, and the experimental observation of violations of that... would never have been discovered if not for the existence of quantum formalism. On the other hand, the inequality... is derived without any mention of quantum theory and the violations are matters of plain experimental fact. So the explication and analysis of the importance of Bell's work can in principle proceed without mentioning quantum mechanics at all. Should an account of Bell's inequality emphasize its historical roots... or... sever those ties in the interest of clarity? ...I chose the second option ...the interpretation of quantum theory is troublesome enough ...to overshadow and confuse the relatively straightforward proof on non-locality.

Although this book is not the place to thrash out those issues, I have thrashed them... in other places.

Pictures of space-time look misleadingly like pictures of space, and the novice must unlearn some of the conventions...