In this episode, Mark talks with chemistry teacher Scott Milam. They talk about his interest in the history of chemistry thinking and the development of models in chemistry as far back as hundreds of years ago. They talk about how Scott thinks about teaching chemistry, and the questions he is focusing on right now. This leads them to talk about setting up assessments so he focuses very intentionally on key goals in each unit. They also talk about his chemistry content, his YouTube Channel, and Scott's book Teaching Introductory Chemistry.