"At the beginning of the academic year 1946-1947, Karl R. Popper received an invitation from the Secretary of the Moral Science Club in Cambridge to give a lecture. This was the occasion for the clash between Popper and Wittgenstein on the tasks of philosophy. But here is what happened the day after Popper gave his lecture. The next day, Popper recounts in his Autobiography, on the train to London, there were two students sitting opposite each other in my compartment, a boy reading a book and a girl reading a left-wing newspaper. Suddenly, the girl asked, “Who is this Karl Popper?” And the boy replied, “Never heard of him”. Such is fame. (I later learned that the newspaper contained an attack on “The Open Society”)."