Recently, a colleague and I were lamenting the process of growing older and the inevitable increasing difficulty of remembering things we want to remember. That becomes particularly annoying when you attend a conference or a learning seminar and find yourself forgetting the entire session just days later.

But then my colleague told me about the Ebbinghaus Forgetting Curve, a 100-year-old formula developed by German psychologist Hermann Ebbinghaus, who pioneered the experimental study of memory. The psychologist’s work has resurfaced recently and has been making its way around college campuses as a tool to help students remember lecture material. For example, the University of Waterloo explains the curve and how to use it on the Campus Wellness website. I teach at Indiana University and a student mentioned it to me in class as a study aid he uses. Intrigued, I tried it out too–more on that in a moment.