There are cameras in china's classrooms that monitors the students faces every 30 seconds. It is supposed to be able to capture their moods for the teachers. The moods recorded include surprised, sad, antipathy, angry, happy, afraid, and neutral. It is also supposed to be able to give the teacher a list of names of students not paying attention. At least is don't show lust 
This is one tech that I hope never comes to the states.
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