ChemAttitudes: Using Design-Based Research to Develop and Disseminate Strategies and Materials to Support Chemistry Interest, Relevance, and Self-Efficacy (ChemAttitudes, NSF DRL-1612482) is a collaborative project between the Museum of Science, Boston (MOS), the National Informal STEM Education Network (NISE Net), and the American Chemical Society (ACS) among others. As a part of this project, researchers and educators from MOS and the Science Museum of Minnesota (SMM) used design-based research to create chemistry hands-on activities meant to positively impact visitors’ attitudes towards