Although the media is showering praise on the “flipped classroom” model, there is minimal research of its effectiveness on student learning. In a flipped classroom, students receive instruction at home, and the classroom is used for the development of skills and practice. In fall of 2012, two Advanced Placement Calculus classes were used to test the efficacy of the flipped classroom; one was taught by the traditional method and the other was taught using the flipped classroom model. In the flipped class model, students received instruction at home from videos on the website BeyondCalculus.com, and in class, worked in small learning communities to problem-solve. Although the two classes began with the same knowledge of pre-calculus, by the end of differential calculus, the experimental class scored dramatically higher on past AP exams, and was able to reason at a demonstrably higher level. Students reported that the flipped classroom individualized learning, provided more support than traditional classes, and emphasized content and understanding. Used effectively, the flipped classroom model has the potential to revolutionize the method in which students lea