The author believes that "learning is doing," especially in science. The best way she can describe what she did, and the piece of advice she wants to pass on, is "make it active and mix it up". By describing how she went about teaching this lesson, she hopes she has conveyed how doing one's research (online for a start) and using a "variety" of formats to teach really helps lessons to go smoothly. Plus, the more "interactive," or just "active," the learning can be the better, particularly if one needs to maintain attention for a long time. (Contains 3 figures and 4 online resources.)