Psychology
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Psychology is the scientific study and evaluation of mind and behavior. Psychological research focuses on many sub-topics including: personality, behavior, addiction, learning, value systems, and relationships. Psychology can also refer to the application of that knowledge to various spheres of human activity, including correcting problems that affect individuals' daily lives and the treatment of mental health issues.
The word psychology comes from the ancient Greek ψυχή psyche ("soul," "mind") and -λογία -ology ("study").