In 1990s Robin Dunbar, a British anthropologist, developed a controversial theory about the upper reaches of the human brain for social groupings. After studying hunter-gatherer tribes, rural townships, and other primates, he concluded that the human brain is capable of maintaining a maximum (on average) of 150 close relationships. This became known as Dunbar's Number, and it has since been scrutinized, corroborated, and criticized. However, it remains an important concept to the modern human as we navigate some very new social constructs.
Dunbar's theory began merely as an empirical finding. He noticed that different primates seemed to band together in