Chris Dunlap is a Nuclear Security Postdoctoral Fellow at CISAC. His research is funded by the MacArthur Foundation. His book project, developed from his dissertation, focuses on the fundamental role of nuclear energy technology and diplomacy in shaping modern Brazil and Argentina and their bilateral relationship. The paths taken to develop nuclear energy in the South American neighbor countries also illustrate the impact that these nations and their key actors, often left out of global energy history, made upon the physical, legal, and diplomatic structures of the Atomic Age. By 1995, both nations had ceased early-stage efforts toward a nuclear explosion, accepted full safeguards and international verification of all fuel cycle activities, and transformed the "imported magic" of nuclear technology into their own. How this happened, and why, is the history at the heart of the parallel power play that defined Brazil and Argentina's engagement with Atomic Age diplomacy and technology.