World renowned professor of evolutionary psychology, Robin Dunbar, explains his famous theory of social group size which suggests there is a limited number of relationships that humans (and other primates) can maintain. We also discuss some of his other findings related to social bonding and the release of endorphins activated by laughing, singing, and dancing together. Professor Dunbar is with the Department of Experimental Psychology at Oxford University and he’s a Fellow of Magdalen College.

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