Variety (complexity) of a control system must match or exceed the variety of the system being controlled in order to effectively regulate it.
Apparent contradiction between the high probability of the existence of extraterrestrial civilizations and the lack of evidence for, or communication with, such civilizations.
Theory that natural selection has favored organisms that perceive the world in a way that maximizes their chances of survival and reproduction.
Study of how natural and physical spaces are perceived and understood by people.
Process of creating digital products that are easy and enjoyable to use for the people who interact with them.