Peter LePage from the Cornell Physics Department joins us on our extra special 50th episode to talk about active learning pedagogy. He shares his first teaching experiences, his introduction to physics education research, and why he believes students benefit from problem solving and discussion in class. We also talk about the Active Learning Inititive, a program Peter started at Cornell that was inspired by Carl Wieman's Science Education Initiave. Both programs aim to change the culture of teaching in higher ed by giving departments large grants to radically overhaul how they teach their undergraduate courses.