Psychics have mental abilities or phenomena that are apparently inexplicable by known natural laws, since they seem to transcend the confines of the brain. People who are thought to have these abilities or to be able to produce these phenomena are often called "psychics". The term comes from the Greek word psychikos, meaning "of the soul, mental," which is in turn derived from the Greek word psyche (soul/mind). Professional psychics have usually one or more specialized areas of expertise such as: