"By using the average human brain size and extrapolating from the results of primates, he proposed that humans can comfortably maintain 150 stable relationships."
https://en.wikipedia.org/wiki/Dunbar%27s_number
"By using the average human brain size and extrapolating from the results of primates, he proposed that humans can comfortably maintain 150 stable relationships."
https://en.wikipedia.org/wiki/Dunbar%27s_number