Steven Johnson: Coffee Fueled the Age of Enlightenmentbr Book Passage - Book Passagebr Steven Johnson talks about his book, The Invention of Air.Johnson recounts the story of Joseph Priestley -- scientist and theologian, protege of Benjamin Franklin -- an 18th-century radical thinker who played pivotal roles in the invention of ecosystem science, the founding of the Unitarian Church, and the intellectual development of the U.S.