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People like my coauthor levitt who understands the mind of a cheater. you learn to look at data in a new way. we wrote about it in "superfreakonomics." we wrote about catching cheating teachers. no child left behind. we like that account, make them accountable. but it changed teachers' behaviors. how do you find them? in the data. look for pattern, for instance, a kid will fill in 30 questions and leave ten blank. lo and behold they fill in the last ten and got all the last ten correct. that wasn't the student, that was the teacher. >> glenn: holy cow. >> until you learn to think like a charte...

People like my coauthor levitt who understands the mind of a cheater. you learn to look at data in a new way. we wrote about it in "superfreakonomics." we wrote about catching cheating teachers. no child left behind. we like that account, make them accountable. but it changed teachers' behaviors. how do you find them? in the data. look for pattern, for instance, a kid will fill in 30 questions and leave ten blank. lo and behold they fill in the last ten and got all the last ten correct. that wasn't the student, that was the teacher. >> glenn: holy cow. >> until you learn to think like a charte...