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x1967 Gives a lecture in Amsterdam, ‘Epistemology without aKnowing Subject’, in which he formulates for the first timethe theory of World 3.1969 Gives up teaching at the University of London, but continueshis writing and lecturing activity.1971 Bavarian Radio broadcasts a long-distance debate betweenPopper and Marcuse later published as Revolution oderReform?1972 Publishes Objective Knowledge, in which he develops histheory of the objective mind (Worlds 1, 2 and 3).1974 Two volumes in the Library of Living Philosophers series aredevoted to his thought—including his IntellectualAutobiography (later republished as Unended Quest) and‘Replies to My Critics’.1977 Publishes a book jointly written with John Eccles, The Self andIts Brain.1979 Popper’s first work, Die beiden Grundprobleme derErkenntnistheorie, is finally published in its original form. On8 July he is awarded an ad honorem degree of FrankfurtUniversity, and on 27 July an honoris causa degree ofSalzburg University.1981 The first French conference on Popper’s thought.1983 Between 24 and 26 May a Popper Symposium is held inVienna.1985 Death of his wife. Moves from Penn to London.1986 Visiting professor at the University of Vienna.1987 A conference, entitled ‘The Philosophy of CriticalRationalism’, is organized for his 85th birthday in Dubrovnik,between 28 September and 9 October. It is attended byscholars from various countries.1988 On 24 August he gives a lecture, ‘A World of Propensities’, atthe World Congress of Philosophy in Brighton.1989 On 9 June he gives a lecture, ‘Towards an EvolutionaryTheory of Knowledge’, at the London School of Economics.1990 Publishes A World of Propensities.1991 Gives press and television interviews about major politicalevents such as the Gulf War and the break-up of the SovietUnion.1992 His views on recent events that have changed the shape