Caring about someone deeply is exhausting. Somewhere between 10 and 15 people is when we begin to overload.
The Tipping PointMost of human evolution took place before the advent of agriculture when men lived in small groups, on a face-to-face basis. As a result human biology has evolved as an adaptive mechanism to conditions that have largely ceased to exist. Man evolved to feel strongly about few people, short distances, and relatively brief intervals of time; and these re still the dimension of life that are important to him.
The Tipping PointThe Law of the Few says that Connectors, Mavens, and Salesman are responsible for starting word-of-mouth epidemics.
The Tipping PointTranslators take ideas and information from highly specialized world and translate them into a language the rest of us can understand.
The Tipping PointHumans socialize in the largest groups of all primates because we are the only animals with brains large enough to handle the complexities of that social arrangement.
The Tipping PointIf you look at any species of primate, the larger the neocortex is, the larger the average size of the groups they live with.
The Tipping Point