David Gordon (Bowdoin, History) on his recent book Invisible Agents: Spirits in a Central African History. Gordon explores how and why spirits and discourses about spirits inspired social movements and influenced historical change, from precolonial Bemba chieftaincies and 1930s Watchtower millenarianism to the postcolonial state's humanism and Pentecostalism under Kaunda and Chiluba, respectively. Gordon closes by noting the effervescence of Zambian studies today. (Note: the interview was recorded via Skype.)