The best-selling author of The Professor and the Madman explores the rich and complex history of our relationship with the planet's 37 billion acres of habitable land: who mapped it, owned it, stole it, cared for it, fought for it, and gave it back.

First broadcast 4 February 2021. Phillip Adams will be speaking to Simon Winchester about his new book Knowing What We Know: The Transmission of Knowledge: From Ancient Wisdom to Modern Magic at RN's Big Weekend of Books on Sunday June 18th.