“…Program Description. The importance of informal STEM education in the format offered by the NHAS is supported by research indicating that this model can play an important role in attracting and retaining underrepresented secondary school students in STEM careers, especially girls (Edelson et al, 1999;Hill et al, 2018;Lowell B Lindsay et al, 2009;Miyake, 2017;Riedinger and Taylor, 2016;Stevenson et al, 2021;Tan et al, 2013). Both our institutional experience and the literature suggest that informal STEM programs make durable impacts via the following approaches: a) providing opportunities to conduct scientific research, b) giving multiple chances to interact with a variety of STEM profession-als, c) supplying opportunities to work and correspond with a diverse group to break stereotypes early in the pipeline, and d) performing research that is both culturally relevant to the students and developmentally appropriate, where the complexity of the project matches the knowledge base and comfort level of the student (Cheryan et al, 2015;Hill et al, 2018;National Research Council, 2009;National Science Foundation, 2020;Pluth et al, 2015;Riedinger and Taylor, 2016;Robinson et al, 2016).…”