CORINNE PURTIL: For humans, memory is essential to maintaining our complex web of social relationships. We have to remember who is a friend and who is a foe; who can be counted on for loyalty and who royally screwed you over during the last struggle for dominance. Bonobos and chimpanzees, our closest living relatives, maintain … Continue reading STUDY: Chimps and bonobos can recognize long-lost friends and family for decades