"[During 1940s], Einstein was pursuing what he called his ‘‘violon d’Ingres’’—his unified field theory... The so-called strange particles were just being discovered, and the quantum theory was proving ever more powerful. Einstein simply was not much interested. His position was that it was useless to try to understand this new physics until the electron was understood. We now believe that understanding the electron is such an intimate part of the new physics that the electron cannot be understood by itself. But Besso took all his old friend’s attempts extremely seriously, and Einstein gave him detailed explanations of his various formal manipulations. It was a dialogue that somehow reminds me of the plays of Samuel Beckett."