Pete Brown used to advertise lager for a living, until he realized that writing books about beer was even more fun, and entailed drinking even more beer. He appears regularly on television as a beer expert, writes on beer for a variety of publications and is the author of Man Walks into a Pub and the award-winning travel book Three Sheets to the Wind. In this fascinating episode, he discusses the extroardinary history of beer and its rise to become one of the most popular drinks in the world.