This issue, we ask “5 Questions” of William Johnston, professor of history, professor of science in society, professor of East Asian Studies. One of his areas of specialty is the history of disease and epidemics. Q: How did you become interested in the history of diseases, and more specifically, flu outbreaks? A: While in graduate school I examined a number of different fields of history, but was drawn to the history of medicine in Japan because it was in that field that the Japanese first absorbed European scientific ideas and methods. My advisor suggested that I take courses in the…