The new documentary "TEACH," to air on CBS on Friday, focuses on examples of great teaching nationwide. The film, by Davis Guggenheim -- who also released "Waiting for 'Superman' " -- follows Matt Johnson, a fourth-grade teacher in Denver; Shelby Harris, a middle-grades mathematics teacher in Kuna, Idaho; Lindsay Chinn, a ninth-grade algebra teacher in Denver; and Joel Laguna, an Advanced Placement world history teacher at Garfield High School in Los Angeles. In an interview, Guggenheim said the public needs to understand what teachers do in order to improve schools.

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