Scott Jenkins, a philosopher at the University of Kansas, has written a generous review of the book of new essays edited by Neil Sinhababu and myself, Nietzsche and Morality. The review is also quite informative, offering nice capsule summaries of the arguments of each essay, as well as astute questions and criticisms. I plan to take up in subsequent work the question Professor Jenkins poses about my essay with Joshua Knobe. The puzzle, in a nutshell, is this. If, as Knobe and I argue, Nietzschean moral psychology presupposes a more credible psychology than other important philosophical theories (such as Aristotle's and Kant's), what explains this fact, given that Nietzsche's primary methods of psychological investigation--namely, introspection and non-systematic observation (both his own and that of other astute observers of human behavior, from Thucydides to La Rochefoucauld)--are not one that would be considered epistemically robust these days.?Did Nietzsche just get lucky? Or does his success tell us something important about knowledge and truth in the human sciences?