“A colleague who met me strolling rather aimlessly in the beautiful streets of Copenhagen said to me in a friendly manner, "You look very unhappy"; whereupon I answered fiercely, "How can one look happy when he is thinking about the anomalous Zeeman effect?".” ThinkingLooksSaidBeautifulStreetsEffectsMetsUnhappyFriendlyColleaguesStrollingCopenhagen Book:Wolfgang Pauli: das Gewissen der Physik Source: Wolfgang Pauli: das Gewissen der Physik