Nikolai DiPippa, Clinton School Director of Public Programs, sat down with Brian Fagan, Professor emeritus of anthropology at the University of California, Santa Barbara and New York Times best-selling author. Fagan, an archaeological generalist with expertise in the broad issues of human prehistory, is the author of "Elixir: A History of Water and Humankind," which examines the history of water spanning a period from about 10,000 years ago up to the Industrial Revolution, when people began deep pumping from subterranean aquifers, using fossil fuels.