Share Tweet Share tumblr reddit AllPsychlopedia Psychology Reference Timeline of Psychology Timeline of Psychology from 387 BC to the present. Psychology Biographies Psychology Biographies of important psychologists in history. Psychology Dictionary Psychology Dictionary with over 500 psychology terms defined. Psychology Bookshelf Psychology Bookshelf with book reviews and recommendations for students of all ages. Optical Illusions How many legs does an elephant have? How is that image moving? These Optical Illusions may make you doubt your own eyes. Psychiatric Disorders Psychiatric Disorders includes symptoms, etiology, treatment and prognosis for over 50 of the most common disorders.