Yesterday on Twitter and Facebook, we asked our friends: What's the difference between a good teacher and a great teacher?

GOOD and University of Phoenix are proud to announce the launch of The Great American Teach-Off for teachers in grades 7 through 12. Last time, we found amazing teachers who taught in grades kindergarten through sixth grade, so now it's the chance for middle school and high school teachers to get involved! (Click here to see which elementary school teacher won).

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