In this March 2, 2018 photo, Waltham eighth grade Language Arts students relax in their classroom, while teacher Ms. Jaime Voss goes through a lesson plan in Utica, Ill. Voss and other Waltham teachers joined a trend in which teachers let their students spend part of their days perched on milk crates, laundry baskets, high stools, low chairs or simply standing up, wherever they like. It's called flexible seating and studies have shown students concentrate better when they can adopt the same poses and seating arrangements at home. (Tracey MacLeod/NewsTribune via AP)/NewsTribune via AP)
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