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In a Feb. 16, 2017 photo, teacher Kate Stoltzfus stands in a projector light during her algebra class at Pequea Valley High Schoo in Kinzers, Pa. The district is having success with its personalized learning approach to education. (Dan Marschka/LNP via AP)

In a Feb. 16, 2017 photo, teacher Kate Stoltzfus stands in a projector light during her algebra class at Pequea Valley High Schoo in Kinzers, Pa. The district is having success with its personalized learning approach to education. (Dan Marschka/LNP via AP)

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