Is Punishment or Reward More Effective? [video](youtube.com)
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Is Punishment or Reward More Effective? [video]
http://www.youtube.com/watch?v=1tSqSMOyNFE&feature=em-uploademail
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http://www.youtube.com/watch?v=1tSqSMOyNFE&feature=em-uploademail
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