EdSurge reports that one of the more interesting pieces of new edtech research is a paper by Telmo Zarraonandia of the Universidad Carlos III de Madrid in which he describes a pilot experiment involving his latest creation: an “Augmented Lecture Feedback” (ALF) system. So, what exactly is an ALF system? Imagine you're teaching a geometry lesson. There are eight minutes of class left and you can't decide whether to spend it reviewing old concepts or introducing a new one. So you press a button on your smartphone and, on your glasses, a bubble appears on each student’s head showing their...

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