This is number 9 in my series on learning theories. My intention is to work through the alphabet of psychologists and provide a brief overview of each theory, and how it can be applied in education. In the last post we examined Yrjö Engeström's Second Generation Activity Theory [http://en.wikipedia.org/wiki/Activity_theory] and its applications to education. In this post, we explore the work of Hermann Ebbinghaus on memory and learning. This is a simplified interpretation of the theory, so if you wish to learn more, please read the associated literature.