G-Man (Half-Life) refers to simply as his "employers". His mysterious nature has made him an icon of the "Half-Life" series, with his identity and motives remaining almost completely unexplained. The G-Man's name comes from "G-Man", an American colloquialism meaning "Government Man". However, within the "Half-Life" games, he is identified by this name only in the program code and the multiplayer profile menu as a default name option, not within the story itself; his name is derived from his "Half-Life" model and entity name and has since been reused in subsequent games of the series. His name has been confirmed and he has
The g Factor: The Science of Mental Ability speed and efficiency of neural processes. The book argues that the "g" factor shows considerable practical validity. It is related to a large number of economically, educationally, and socially valued attributes. It is a particularly good predictor of academic and job-related outcomes. It stresses the difference between "g" and what it calls "vehicles" of "g". Changes in test scores do not necessarily represent changes in the underlying construct, viz., "g". Practice effects on test scores appear to be unrelated to "g". An authentic change in "g" happens when the change shows broad generalizability to a wide variety of cognitive tasks.