In this issue: Curriculum and Professional Development for OST Science Education: Lessons Learned from California 4-HBy Steven M. Worker and Martin H. Smith Keeping Children Safe: Afterschool Staff and Mandated Child Maltreatment ReportingBy Maria Gandarilla and Julie O\u27Donnell Long-Term Participants: A Museum Program Enhances Girls’ STEM Interest, Motivation, and PersistenceBy Jennifer D. Adams, Preeti Gupta, and Alix Cotumaccio Paper Copters and Potential: Leveraging Afterschool and Youth Development Trainers to Extend the Reach of STEM ProgramsBy Stephanie A. Lingwood and Jennifer B. Sorensen The Quest for MasteryBy Diane Gruber, M.A. The Role of Out-of-School Time in Reducing Hunger and Preventing ObesityBy Daniel W. Hatcher, Crystal...