Demonstrating the fragility of the results on which many important international relations theories are based, Choi's book gives the reader a renewed appreciation for the vital role of replication in 'normal science' as an achievable goal rather than a rarefied, albeit unrealistic, Popperian ideal. We can only hope that more researchers devote their time to replicating foundational studies in international relations, for the sake of advancing the field and generating well-informed policy advice.