"Mental Illness" will discuss different disorders, laws, as well as treatment of the mentally ill during earlier time periods. Decide for yourself when a stigma is a potential drawback or concern for the mental health of a person with a legitimate disorder. "Clinical Psychology" discusses the evolving nature of the history of psychology while demonstrating the use of research and statistics. Many may believe clinical psychology to be the only sub-discipline of the broader field, yet it should be understood it is just one aspect of psychology. "Biological Psychology" begins by defining biopsychology and continues by explaining the development of the sperm cell. The formation of a scientific psychology occurs during the 19th century prior to the official beginnings of the discipline of psychology. "Abnormal Psychology" focuses on the origins of abnormal behavior and its evolution into a scientific principle. Abnormal behavior may be in existence since the beginning of mankind yet its study is barely over 100 years.