My friend Andrew is an advocate of the “spaced repetition” technique for memorization of a great many facts [1]. The ideas behind this are two-fold: When one first “learns” a new fact, it needs to be reviewed frequently in order to not forget it. However, with each additional review, the fact can be retained longer before a refresher is needed to maintain it in recall. Because of this, one can maintain a large, growing body of facts in recall through daily review: Each day, one need only revi...