At an animal sanctuary in the Congo, young students are learning why the gentle, endangered apes known as bonobos should be seen as a national treasure.

Research on bonobos, one of our closest and gentlest relatives, may show how humans evolved to share and cooperate on a massive scale.

Duke anthropologist Brian Hare argues that humans evolved in a way that left us more cooperative and friendlier than our now extinct human cousins, like Neanderthals and Denisovans.