Intellectual curiosity is curiosity that leads to an acquisition of general knowledge. It can include curiosity about such things as what objects are composed of, the underlying mechanisms of systems, mathematical relationships, languages, social norms, and history. It can be differentiated from another type of curiosity that does not lead to acquisition of general knowledge, such as curiosity about the intimate secrets of other people. It is a facet of openness to experience in the Five Factor Model used to describe human personalities. It is similar to need for cognition and typical intellectual engagement.