The document discusses a study led by Louis Deslauriers at Harvard comparing students' self-perceived learning with actual learning outcomes in physics courses taught through either active or passive instruction. The findings indicate that cognitive fluency from experienced instructors can mislead students about their true learning, highlighting the importance of teaching methods that might feel challenging but lead to deeper understanding. Recommendations include early interventions to change student attitudes toward active learning and caution regarding the reliance on student evaluations of teaching as they may favor less effective teaching methods.