The COVID-19 pandemic is just the latest iteration of what Charles Kenny calls an unending war between humanity and infectious disease. His new book "The Plague Cycle" documents and describes how the course of human history has been shaped by infectious disease from thousands of years ago to early 2021.   Guest: Charles Kenny,  senior fellow with the Center for Global Development and author of The Plague Cycle: The Unending War Between Humanity and Infectious Disease   Get a premium subscription!