In his new book The World Until Yesterday, bestselling anthropologist Jared Diamond (Guns, Germs and Steel) draws on his 50 years spent in Papua New Guinea to share lessons learned from the few tribal societies left in the world – from parenting to conflict resolution, and diet to danger assessment.

In this excerpt of his talk, he discusses some of the ways tribal societies can inform the way we choose to live –particularly, with regard to how we treat our elders.