Thomas Kuhn and Karl Popper are believed by many who study science to be the two key thinkers of the twentieth century. Each addressed the question of how scientific theories change, but they came to different conclusions. By turning our attention to ambiguity and indecision in science, Menachem Fisch, in Creatively Undecided, offers a new way to look at how scientific understandings change. Following Kuhn, Fisch argues that scientific...