Psychology is the study of the mind and behavior. American Psychological Association (2013), "the discipline embraces all aspects of the human experience — from the functions of the brain to the actions of nations, from child development to care for the aged" (para. 1). American Psychological Association (2013), "in every conceivable setting from scientific research centers to mental health care services, "the understanding of behavior" is the enterprise of psychologists" (para. 1).