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In this Friday, Feb. 10, 2017 photo, Amy Williams, a teacher at Elizabeth Forward Middle School, practices with a virtual reality set during a class at the Allegheny Intermediate Unit in Homestead, Pa. (Nate Smallwood /Pittsburgh Tribune-Review via AP)

In this Friday, Feb. 10, 2017 photo, Amy Williams, a teacher at Elizabeth Forward Middle School, practices with a virtual reality set during a class at the Allegheny Intermediate Unit in Homestead, Pa. (Nate Smallwood /Pittsburgh Tribune-Review via AP)

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