Mononucleosis, commonly called mono, is an illness caused by the Epstein-Barr virus. Although it's rarely serious, mono can cause bothersome symptoms that last several weeks.
Complex systems. Complex systems present problems both in mathematical modelling and philosophical foundations. The study of complex systems is an approach to science that investigates how relationships between parts give rise to the collective behaviors of a system and how the system interacts and forms relationships with its environment.
study of the relationships between the brain, mind, body, and behavior; focuses on establishing general principles that govern and explain understanding how the brain, nervous, and endocrine (hormonal) systems generate and control behavior and mental processes; branch of both psychology and neuroscience.