This paper presents basic information about the brain and how learning takes place, considers causes of differing human temperaments as explained by principles of Jungian psychology, reports on research on the causes of low achievement, and suggests a method to correct many educational problems. Principles of developmental neurology and right/left brain differences are explained. Many educational problems (such as anger and anxiety) are viewed as resulting from downshifting from the neo-cortex to the limbic system. Four major temperament groups are identified, varying in the dominance and influence of right and left brain hemispheres. The paper reports positive behavioral and academic effects observed when junior high school students were provided with basic information on the brain and suggestions for controlling and preventing downshifting. The seven types of intelligence postulated by Howard Gardner are also discussed. Teachers are urged to: (1) teach students about the brain; (2) explain the whole picture before starting a unit; (3) adapt material for the poor reader; (4) outline and organize for students with dominant right hemispheres; (5) adapt for students with auditory, visual, and kinesthetic, right/left hemispheric learning modalities; (6) hold high positive expectations and guarantee success; (7) use discipline based on principles of preventing downshifting; and (8) set up the classroom to maximize fairness and caring. Problems with grading are discussed. Contains six references. (DB)