Bob Hall¿is a professional artist who has worked for Marvel Comics and DC Comics and drawn some of the most famous comic heroes of all time, including Batman, Spiderman, Thor, Captain America, and the Avengers. John West is a research associate professor in the Nebraska Center for Virology at the University of Nebraska–Lincoln. He¿manages a virology research program dedicated to understanding molecular aspects of viral gene expression as well as molecular epidemiology and antiviral immune responses. Judy Diamond is a professor and curator of informal science education at the University of Nebraska State Museum and the coauthor of World of Viruses (Nebraska, 2012). Carl Zimmer¿is an award-winning science journalist and columnist at the New York Times.¿He is the author of twelve books about science, including A Planet of Viruses. ¿