For this episode, Red is joined by John Keay, a British historian with an international reputation for writing accessible biographies of India, The Far East and China. In his new book, Himalaya: Exploring the Roof of the World, he presents us with a meticulously researched and characterful history of one of the world’s last great wildernesses and, in particular, of the bizarre discoveries and improbable achievements of its pioneers. It has mesmerized scholars and mystics, sportsmen and spies, pilgrims and mapmakers, all of whom have mingled with its farmers and traders on the "Roof of the World." But it is also the portrait of an area, the size of Europe, that continues to be riven by conflict and is under increasing ecological threat. Join John and Red as they discuss Himalaya’s geology, exploration, exploitation and future as one of the world’s most essential and endangered wonders.