Three Mile Island burst into the nation's headlines twenty-five years ago, forever changing our view of nuclear power. The dramatic accident held the world's attention for an unsetting week in March 1979 as engineers struggled to understand what had happened and to bring the damaged reactor to a safe condition. Much has been written since then about TMI, but it is not easy to find up-to-date information that is both reliable and accessible to the non-scientific reader. TMI 25 Years Later offers a much needed "one-stop" resource for a new generation of citizens, students, and policymakers. The legacy of TMI has been far-reaching. The worst nuclear accident in U.S. history marked a turning point in our policies, our perceptions, and our national identity. Those involved in the nuclear industry today study the scenario carefully and review the decontamination and recovery process. Risk management and the ability to convey risks to the general population rationally and understandably are an integral part of implementation of new technologies.