What are the underlying reasons for favoring or rejecting nuclear energy? How can we explain this variety of perceptions? What is the specific role of perceived risks and benefits? How much weight do these factors have in shaping public opinions? Answers to these questions will be provided by the paper “Risky or Beneficial? Exploring Perceptions of Nuclear Energy over Time in a Cross-Country Perspective” that compares citizen attitudes to nuclear power in seven European countries and the United States. The paper is part of the recently published volume “Engaging the Atom. The History of Nuclear Energy and Society in Europe from the 1950s to the Present”.