| A few years ago, the psychologist Daniel Oppenheimer asked some high school teachers to reformat the handouts they were giving to some of their classes. The regular handout would be formatted in something straightforward, such as Helvetica. But half these classes were getting handouts that were formatted in something sort of intense, like Haettenschweiler, or something with a zesty bounce, like Comic Sans italicized. Now, these are really ugly fonts, and they're difficult fonts to read. But at the end of the semester, students were given exams, and the students who'd been asked to read the more difficult fonts had actually done better on their exams, in a variety of subjects. And the reason is, the difficult font had slowed them down, forced them to work a bit harder, to think a bit more about what they were reading, to interpret it ... and so they learned more. " | 
