Substantial gender equity gaps in postsecondary degree completion persist within many science, technology, engineering, and mathematics (STEM) disciplines, and these disparities have not narrowed during the 21st century. Various explanations of this phenomenon have been offered; one possibility that has received limited attention is that the sparse representation of women itself has adverse effects on the academic achievement-and ultimately the persistence and graduation-of women who take STEM courses. This study explored the relationship between two forms of gender representation (i.e., the proportion of female students within a course and the presence of a female instructor) and grades within a sample of 11,958 STEM-interested undergraduates enrolled in 8686 different STEM courses at 20 colleges and universities. Female student representation within a course predicted greater academic achievement in STEM for all students, and these findings were generally stronger among female students than male students. Female students also consistently benefitted more than male students from having a female STEM instructor. These findings were largely similar across a range of student and course characteristics and were robust to different analytic approaches; a notable exception was that female student representation had particularly favorable outcomes for female students (relative to male students) within mathematics/statistics and computer science courses.

Argumentation is a central epistemic process contributing to the generation, evaluation, and application of scientific knowledge. A key challenge for science educators and researchers is to understand how the important social and discursive ("social dialogic") dimensions of argumentation can be implemented in learning environments. This study investigates how science educators learned about such argumentation through a professional development program at a scientific research center. The 13-day program included 5-days working in research laboratories with a mentor and observing scientific argumentation in context. Theoretically, this research draws on sociocultural frameworks to investigate the social dialogic dimensions of scientific argumentation. Methodologically, it examines the reflections of a cohort of 21 secondary science teachers as they observed argumentation in scientific research settings. It examines how research experiences for teachers can promote an understanding of the social dialogic dimensions of argumentation and to help teachers take up educational approaches that foster expansive argumentation practices. Teachers shared a heightened awareness of argumentation as a ubiquitous, embedded feature of authentic scientific activity; expanded ideas about forms, uses, and purposes of argumentation; and developed an understanding of how contexts for argumentation such as collaborative sensemaking and critique can help manage uncertainty and build knowledge. A year after their program participation, teachers recounted shifts in pedagogical practices, including desettling traditional classroom talk patterns, scaling back their epistemic authority, providing students with more agency and ownership of ideas, and recognizing the value of establishing a culture of community and collaboration. Findings highlight how professional development in research settings has the potential to broaden teachers' views of argumentation, with implications for secondary science teaching.

The pandemic outbreak of COVID-19 has highlighted an urgent need for infectious disease education for K-12 students. To gather a better understanding of what educational interventions have been conducted and to what effect, we performed a scoping review. We identified and examined 23 empirical researcher- and teacher-designed studies conducted in the last 20 years that have reported on efforts to help K-12 students learn about infectious diseases, with a focus on respiratory transmission. Our review shows studies of educational interventions on this topic are rare, especially with regard to the more population-scale (vs. cellular level) concepts of epidemiology. Furthermore, efforts to educate youth about infectious disease primarily focused on secondary school students, with an emphasis on interactive learning environments to model or simulate both cellular-level and population-level attributes of infectious disease. Studies were only mildly successful in raising science interest, with somewhat stronger findings on helping students engage in scientific inquiry on the biology of infectious diseases and/or community spread. Most importantly, efforts left out critical dimensions of transmission dynamics key to understanding implications for public health. Based on our review, we articulate implications for further research and development in this important domain.

There have been many practical obstacles for teachers to implement evidence-based educational technology, especially in STEM classrooms. By implementing learning principles related to Cognitive Load Theory, we developed an innovative Technology-Assisted Guided Learning (TAGL) approach and its web-based instructional tool, combining expertise from educational research and best teaching practices to enhance guided student-centered learning in chemistry. A total of 185 community college students were randomly assigned to learn stoichiometry through either TAGL or one of two active control interventions, traditional direct instruction and Khan Academy, a widely used web learning platform. We found that the TAGL group significantly outperformed both active control groups immediately after instruction, and furthermore, despite the fact that all groups received additional instruction in stoichiometry, the beneficial effects of TAGL compared to the control groups were maintained a month later. Notably, TAGL was able to eliminate the achievement gap between students with low prior knowledge and students with high prior knowledge. Furthermore, prior-knowledge activation was found to be especially beneficial for students with low prior knowledge. Our work contributes to existing research in learning theories and provides new insight toward the development of more effective and adaptive instructional designs. By translating research into practice, this study demonstrates the great potential of using innovative computer-based technology to improve student learning for all.

In this study, we conducted in-depth interviews with 52 college graduates as they entered a Postbaccalaureate Research Education Program (PREP). Our goal was to investigate what it means for these aspiring scientists, most of whom are from groups underrepresented in the sciences, to feel ready to apply to a doctoral program in the biomedical sciences. For our analysis, we developed and used a theoretical framework which integrates concepts from identity-in-practice literature with Bourdieu's formulation of cultural capital and also examined the impact of racial, ethnic, and gender identities on education and career trajectories. Five patterns of identity work for expected engagement with PREP grew out of our analysis: Credential Seekers, PI Aspirants, Path Builders, Discipline Changers, and Interest Testers. These patterns illuminate differences in perceptions of , and within science; external and internal foci of identity work; and expectations for institutional and embodied cultural capital. Our findings show that preparing for graduate education is more complex than acquiring a set of credentials as it is infused with identity work which facilitates readiness . This deeper understanding of individual agency and perceptions allows us to shift the focus away from a deficit model where institutions and programs attempt to "fix" students, and to offer implications for programs designed to support college graduates aspiring to become scientists.