"a young monkey may walk up to his favorite social partner, stick a finger up his nose, and wait for a reaction. If their relationship is good, nothing will happen...function is to test the strength of social bonds to form alliances against other monkeys" https://t.co/ylrKFjWkpd pic.twitter.com/6eSGDInOUi

— Rob Henderson (@robkhenderson) June 18, 2020