The Multi-Site Public Engagement with Science—Synthetic Biology (MSPES) initiative was an Innovations in Development project funded by the National Science Foundation (DRL-1421179) through the Advancing of Informal STEM Learning program (AISL). MSPES promoted public engagement with science (PES)—a model of mutual dialogue and learning between public and scientist audiences—through the creation and distribution of PES kits to nearly 200 informal science education sites around the country. Kits included two types of learning experiences: (1) forum programs during which scientists and teen or