This tutorial on nuclear chemistry for non-scientists explores the basics of radioactive decay and nuclear fission. It contains four interactive simulations that depict fission of a U-235 atom, two types of radioactive chain reactions, and nuclear fusion. Editor’s Note: This tutorial could be highly useful to teachers seeking additional content knowledge in radioactivity and nuclear fission. The conversational language is appropriate for high school students as well. Don’t miss the “”Questions and Quizzes”” and links to additional resources on the topic.