 In 1952, Feyerabend presented his ideas on scientific change to Popper’s LSE seminar and to a gathering of illustrious Wittgensteinians (Elizabeth Anscombe, Peter Geach, H.L.A.Hart and Georg Henrik von Wright) in Anscombe’s Oxford flat. This meeting seems to have been the first airing of the important concept of incommensurability (although not the term itself, which crept into publications only a decade later):