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Associated Press
Robbi Giuliano teaches her fifth grade class as they sit on yoga balls at Westtown-Thornbury Elementary School Monday, Feb. 4, 2013, in West Chester, Pa.  Replacing stationary seats with inflatable bouncers has raised productivity in her fifth-graders at Westtown-Thornbury Elementary School, making students better able to focus on lessons while improving their balance and core strength, she said.   (AP Photo/Matt Rourke)

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