If you did not get the chance to attend Jürg Fröhlich's (ETH Zurich) talk earlier this month, at the conference In honour of Erwin Engeler and Ernst Specker at ETH Zurich, his presentation slides are available for consultation.
Title: A theorist remembers Ernst Specker and tries to assess his ideas on quantum mechanics.
Abstract: I propose to share some reminiscences of Ernst Specker going back to times when I was a student in some of his courses and when I became his colleague at ETH. One of them I have learned from Raoul Bott.I will then sketch the contents of the Kochen-Specker Theorem concerning the non-existence of hidden variables in quantum mechanics. Some recent ideas in understanding the contents of quantum mechanics might also be sketched. I will end by recalling some of Ernst Specker's non-scientific concerns.