In contrast to traditional lecture-based courses, using projects in the classroom pushes students to actively apply what they have learned. In AP50: Physics as a Foundation for Science and Engineering, instructors put aside textbooks and lectures, challenging students instead to construct a machine that meets a real world challenge. Once students are engaged, instructors then begin to make textbook connections, pointing out how fundamental class concepts can enhance the quality of students’ project. This is what Eric Mazur calls the “Trojan Horse” of learning.