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Re:Gamification of teeth brushing by londonymous on Thursday April 09, 2015 @10:09AM (#9347587)
Possibly inspired by Jesse Schell's fantastic DICE2010 talk:

https://youtu.be/9NzFCfZMBkU?t=2m15s

Re:Gamification of teeth brushing by amplebrain on Thursday April 09, 2015 @01:56PM (#9349572)
Interesting talk. Love the multiple examples of the same concept!