Scientists at la Universidad Carlos III of Madrid have designed augmented reality glasses for university professors. Called the Augmented Lecture Feedback System, the glasses allow professors to see symbols over students' heads that signify their understanding of the material. These symbols are activated by the students' cell phones. They can assign themselves a symbol that tells the professor they understand or not, prefer the professor to slow down or if they know an answer to a question. The glasses are meant to allow professors and students to communicate more easily. At a glance, professors will be able to gauge their students' understanding and modify their lecture as appropriate.