Coffee. Most of us are addicted. We need it on Monday mornings, post nights out, during nights out, in fact every morning. And afternoons. Augustine Sedgewick teaches history at the City University of New York. He has a new book out on how coffee reshaped the world as it became one of the most valuable commodities in history and our 'most popular drug.' He talked to me about the journey of coffee from its obscure beginnings in the Arabian peninsula and explained just how it has transformed our landscapes, physiologies, economy and the nature of work itself. _x000D