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Re:Confused in Class? There's an App for that by dreadsword on Wednesday May 02, 2012 @05:23PM (#3921272)
Some bonus thoughts in this comment: http://news.ycombinator.com/item?id=3921258

I like the idea of the code to authenticate students. I guess you'd have to watch out for selection effects in all of this too... an interesting challenge!

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