On October 25, 1946... in a small crowded room at Cambridge University, two of the world’s greatest twentieth-century philosophers, Ludwig Wittgenstein and Karl Popper, came face-to-face for the first and only time. A third man, Lord Bertrand Russell was also present, acting as umpire of the event. The meeting - which lasted only 10 minutes - did not go well. To this day, no one can agree precisely what took... see more