One of three episodes, and based on Jared Diamond's Pulitzer Prize-winning book of the same name, Guns, Germs and Steel traces humanity's journey over the last 13,000 years – from the dawn of farming at the end of the last Ice Age to the realities of life in the twenty-first century.

Inspired by a question put to him on the island of Papua New Guinea more than thirty years ago, Diamond embarks on a world-wide quest to understand the roots of global inequality.

Jared Diamond’s journey of discovery began on the island of Papua New Guinea. There, in 1974, a local named Yali asked Diamond a deceptively simple question: "Why is it that you white people developed so much cargo, but we black people had little cargo of our own?"