One of the primary disputes in the Chicago Public Schools teachers' strike is over Mayor Rahm Emanuel's proposal to link teacher pay to student performance. Robert Ray/AP hide caption

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Striking Chicago Public School teacher Lanessa Mendoza pickets with fellow teachers Monday as Mayor Rahm Emanuel visits students staying at Maranatha Church in Chicago during the strike. M. Spencer Green/AP hide caption

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Republican presidential candidate Mitt Romney and his wife, Ann, greet supporters during an Illinois primary victory party in March. Scott Olson/Getty Images hide caption

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A visitor lays flowers on the Virginia Tech campus in Blacksburg, Va., on April 16, five years after a lone gunman killed 32 people. Many colleges formed threat assessment teams in the aftermath of the Virginia massacre. Daniel Lin/AP hide caption

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Sasha Harris-Cronin and her partner struggled with their daughter Shannon's last name. They finally decided on two middle names and a hybrid hyphenated last name: Shannon Bayard Cronin Harris-Taylor. Courtesy of Sasha Harris-Cronin hide caption

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Universities are delving into online education as a way to cut costs and take in more students. But questions remain as to whether online teaching will bring the same kind of education to students. Sean Gallup/Getty Images hide caption

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President Barack Obama shakes hands with students after urging Congress to pass legislation that would keep federal student loan rates from doubling in the East Room of the White House June 21 in Washington, D.C. Chip Somodevilla/Getty Images hide caption

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Columbia High School graduates walk to their commencement ceremony in Nampa, Idaho. A new Rutgers University study says nearly half of recent high school graduates are still looking for full-time work. Charlie Litchfield/AP hide caption

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Arvind Mahankali, 12, finished third and ninth in the National Spelling Bee in the past two years, and has been stepping up his training, in hopes of finishing first this year. He's even trained his little brother, 8-year-old Srinath, to read phonetics so he can help with the drills. Tovia Smith/NPR hide caption

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Republican presidential candidate Mitt Romney greets supporters at a campaign stop in Omaha, Neb.,on Thursday. Jae C. Hong/AP hide caption

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