Gender equality and women's empowerment are important issues that still need to be addressed, despite some progress in recent years. The United Nations 2030 Agenda for Sustainable Development includes 17 Sustainable Development Goals (SDGs) which aim to tackle various global challenges, including the 4th (Quality Education) and 5th (Gender Equality) goals that were used to frame an activity in a science education subject in a primary education teaching degree. Previous research has found a decrease in girls' interest in STEM and STEM-related jobs in primary and secondary education. To encourage girls in primary education towards STEM-related professions, an activity was organized in a science subject at a university in Navarre, Spain. The goal of this activity was to identify inspiring women scientists who could serve as role models for university and primary school students. A knowledge model, which is a concise and graphical representation of knowledge through concept maps, was created using the methodology of knowledge model design (Cañas et al. Revista De Informática Educativa 13:145-158, 2000) to showcase all the women scientists selected by the students. This final model is publicly accessible and can be shared with any educational center interested in promoting gender diversity in STEM fields. The results showed that the students learned meaningfully as they inquired about women scientists in professions that are typically considered more suitable for men. As these students are trainee primary school teachers, they can become part of an educational network that empowers girls by developing STEM-related activities that promote gender equality.