The Science Action Club (SAC), run by the California Academy of Sciences, engages youth in fun STEM learning experiences by partnering with local and national afterschool networks. Through games, projects, and hands-on activities, youth in SAC investigate nature, document their discoveries, connect with scientists, and design strategies to protect our planet. Afterschool staff receive in-depth training on SAC kits, activity guidebooks, and best practices for teaching STEM in the informal learning environment.