Current research: Monica H. Green, Professor of History, is currently working on a book, The Black Death: A Global History. Plague is a Eurasian disease par excellence. Its causative organism, the bacterium Yersinia pestis, originated on the northern Eurasia steppe sometime in the past 28,000 years, and although it is primarily a disease of wild animals, it has been the documented cause of major human mortality for the past 5000 years. The Black Death pandemic (usually dated 1346-1353, but actually "seeding" strains that survive to the present day) was without doubt the largest pandemic in human history, and our knowledge of it is being repeatedly overturned because of new developments in genetics. Using the new evolutionary narrative of Y. pestis's history provided by genetics, Green is recasting traditional narratives of the Black Death—which previously have seen it primarily as a Mediterranean and western European phenomenon—and broadening the narrative to include central and eastern Eurasia, as well as sub-Saharan Africa. This project seeks to show how and why the Middle Ages shaped the world we still inhabit today, including our own state of Arizona, where plague continues to thrive. With support from the Melikian Center, she presented a paper, "The Migrations of Plague in Mongol Eurasia: Reading Genetics as History,” at the conference, Migrations in Mongol Eurasia: People, Ideas, Artifacts, The Hebrew University of Jerusalem, 18-20 December 2017.