You'd have thought that replacing a human teacher with a swanky robot would be enough to keep the kids interested, but apparently not. The University of Wisconsin-Madison found that supplying a robot teacher didn't in itself max out concentration. In one trial, they put a Wakamaru robot instructor in the classroom with only mediocre results. But then they switched it out for a robot that could read students' EEG signals to tell when they were enjoying Matthew Broderick daydreams, and which could then change its intonation or wave its metallic hands in response. That second robot resulted in far better scores when the students were subsequently quizzed about their lessons, proving once again that teaching is about more than preaching.