Groupings of 150 nearly everywhere

http://www.bloomberg.com/bw/articles/2013-01-10/the-dunbar-number-from-the-guru-of-social-networks For Dunbar, there’s a simple explanation for this: In the same way that human beings can’t breathe underwater or run the 100-meter dash in 2.5 seconds or see microwaves with the naked eye, most cannot maintain many more than 150 meaningful relationships. Cognitively, we’re just not built for it. As with any human trait,…