Frans de Waal is an acclaimed Dutch primatologist and ethologist. He's written and published numerous books, including 'Chimpanzee Cultures,' 'Are We Smart Enough to Know How Smart Animals Are?', 'Mam's Last Hug,' and his most recent book, 'Different: Gender Through the Eyes of a Primatologist.'

In this episode, Frans de Waal and I discuss a number of things, including the instinct for reciprocal cooperation, the characteristics of sex and gender, the necessity of play, reconciliation, how we mismeasure animals, and much more.