Watch 2/15/2013: Subversive Learning on PBS. See more from Need To Know.

This week Need to Know travels to Tucson, Arizona, where a years-long dispute over a Mexican-Studies program has tensions high; supporters say it has helped re-engage at risk students and improved their test scores. Opponents contend it encourages subversive thinking. The show is anchored by Ray Suarez.

Need to Know, Friday at 10 p.m. on PBS 6.

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