Using her powers as a teaching aid in her career as a schoolteacher, Susan is sufficiently successful as to have parents clamouring in large numbers to have their child included in her class. Her approach to history and geography, subjects which children often find rather dull, has particularly captured her class's attention. Parents generally see the occasional need to clean their children's clothing of dried-in bloodstains or ground-in swamp mud as more than compensated for by the broad education being received. A child's description of one of the classic battles from Ankh-Morpork's long history, for example, might be sufficiently vivid and detailed to make the parent think that the description could not have been improved upon if the child had actually seen the battle at first hand—which in fact he has, given the flexibility of time and space Susan has inherited from her grandfather.