Now since “thinking is behaving,”23 and since all behavior is the product of heredity plus the environment, it follows that thinking itself is a product of these elements. Consequently what man knows and the processes by which he comes to know are fully determined by nonrational processes and controls. Furthermore, Skinner adds, these nonrational causes are completely external to man. He does not take in and possess any of the real world, nor does he make copies of it so that he might store it in