"...one major reason is that what school requires students to do -- think abstractly -- is in fact not something our brains are designed to be good at or to enjoy. When we confront a task that requires us to exert mental effort, it is critical that the task be just difficult enough to hold our interest but not so difficult that we give up in frustration. When this balance is struck, it is actually pleasurable to focus the mind for long periods of time." - ta√i