Education

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** FILE ** A worker sweeps outside the College of Computer Science & Technology on the Yuquan campus of Zhejiang University in Hangzhou, China, on Thursday, Feb. 21, 2013. Unit 61398 of the People's Liberation Army, which has been recruiting computer experts from the school for at least a decade, is alleged to be one of several hacking operations run by China's military. (AP Photo)

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Students in Robbi Giuliano's fifth-grade class sit on yoga balls as they complete their assignments at Westtown-Thornbury Elementary School Monday, Feb. 4, 2013, in West Chester, Pa. By making the sitter work to stay balanced, the balls force muscle engagement and increased blood flow, leading to more alertness. (AP Photo/Matt Rourke)

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In this Feb. 10, 2013, photo, Kelly Guarna's 5-year-old daughter Madison pose for a portrait in Mount Carmel, Pa. The kindergartener was suspended from school for making a "terroristic threat" last month after her mother said she talked about shooting a Hello Kitty bubble gun. (AP Photo/Jimmy May)

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President Obama presents a 2012 Citizens Medal to Donna and Carlos Soto, the parents of slain Sandy Hook Elementary School teacher Victoria Soto, on Feb. 15, 2013, during a ceremony in the East Room of the White House. (Associated Press)

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Parent Christy Gorst reacts while reading on her phone a news account detailing the plot by fifth-graders to kill classmates at Fort Colville Elementary School last week, Wednesday night, Feb. 13, 2013, during Colville Schools' Security Forum in Colville, Wash. (AP Photo/The Spokesman-Review, Colin Mulvany)

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** FILE ** In this Wednesday, Feb. 13, 2013, photo, Sullivan High School principal David Springer poses in the school in Sullivan, Ind. Students and staff at the high school are trying to distance themselves from the media frenzy over one local group's plea for a "traditional" prom that would ban gay teens. (AP Photo/Pam Engel)

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President Obama gestures during a speech on education on Feb. 14, 2013, at the Decatur Community Recreation Center in Decatur, Ga. The president is traveling to promote his economic and educational plan that he highlighted in his State of the Union address. (Associated Press)