Nancy Siraisi has been a prolific and leading scholar in the history of medicine and science of the Middle Ages and the Renaissance. This lecture of hers is the twenty-eighth of series of lectures named for Charles Homer Haskins, first chairman of the American Council of Learned Societies (ACLS) and himself a famed medievalist who brought attention to the work of the medieval university and the liberal arts. Siraisi's lecture was presented at the ACLS Annual Meeting in Philadelphia, Pennsylvania, on May 7, 2010. In her lecture, Nancy Siraisi shared her pursuit of learning across all sorts of boundaries. A biography of Nancy Siraisi and an introduction by Pauline Yu are included. (Contains 2 notes.)