The world until yesterday: what can we learn from traditional societies?

Jared Diamond reveals how tribal societies offer an extraordinary window into how our ancestors lived for millions of years - until virtually yesterday, in evolutionary terms - and provide unique, often overlooked insights into human nature.

He writes about his experiences over nearly five decades working and living in New Guinea, an island that is home to 1000 of the world's 7000 languages and one of the most culturally diverse places on Earth.