Marian Breland Bailey was born. A renowned behaviorist, Bailey was one of B.F. Skinner's first graduate students at the University of Minnesota and one of the first applied animal psychologists to utilize operant conditioning.

Among Bailey's best known academic contributions was the classic article 'The Misbehavior of Organisms,' first published in American Psychologist in 1961 which she wrote along with her husband Keller Breland. The article caused a storm among the behaviorist community when the authors stated that: 'After 14 years of continuous conditioning and observation of thousands of animals, it is our reluctant conclusion that the behavior of any species cannot be adequately understood, predicted, or controlled without knowledge of its instinctive patterns, evolutionary history, and ecological niche.'