This new study gets closer to a real-life use for auto-detecting moods. Some existing computer programs already react to users' abilities. The software that runs grad-school admissions tests, such as the GRE, adjusts problem difficulty based on whether the test-taker got the previous problem right (Thus driving test-takers crazy… Is this question easy because I'm good? Or because I'm really bad?). A face-reading program, on the other hand, would help by identifying emotions that have little to do with math ability, but still have a big effect on how kids learn. Sure, a teacher can identify students' emotions, too. But a teacher can't be there all the time, watching every single child's face. In the Tilburg study, the face-reading software guessed difficulty levels correctly 71 percent of the time. The software isn't a responsive Number Crunchers--but someday it could be, the researchers say.