Chain Reactions is an essential read for those interested in the history and future of our applications of the atomic nucleus. It is enlightening, engaging, tragic, funny, accurate, and optimistic, all at once. Lucy Jane Santos' research and analysis have uncovered nearly-forgotten archival information and cleanly extracted an authoritative reality from stories riddled with myth and controversy. I've engaged with nuclear history for the past 20 years, and yet still learned something new and important on each page.