The southern United States was hit by a dramatic epidemic of a mysterious disease called pellagra in the early twentieth century. This episode discusses the cultural and scientific sources of the outbreak -- from the cotton fields of the south, to the cow pastures of rural Germany, to the river basins of Uganda -- and the incredible lengths a young doctor named Joseph Goldberger went through to try and put an end to this plague. Plus, a new #AdamAnswers about the source of the name “internal medicine.”