Research from Stanford University showed that while Philadelphia had a slightly higher percentage of charter schools outperforming traditional public schools, the city also had many more charter schools — more than half, in some categories — where the students weren't performing as well as they did at their previous school. iStockphoto.com hide caption

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Fifth-graders (from left) Reese Toomre, Lucas Nguyen and Michael An race through the Khan Academy's Trigonometry Challenge. The program allows more advanced students to move ahead, while other students can proceed at their own pace. Larry Abramson/NPR hide caption

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David Bruton of the Denver Broncos is teaching while the NFL works through a lockout. AP hide caption

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Kindergartners at KIPP Empower Academy in South Los Angeles work on laptops while in another corner of the room, a group of students do an activity with a teacher. Larry Abramson/NPR hide caption

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Gibbons Hall at Catholic University of America in Washington, D.C., will be switching from co-ed dorms to single-sex dorms in the fall. Emily Bogle/NPR hide caption

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Charles Gross, a neuroscience professor at Princeton University, looks at a sheep brain with students at San Quentin as part of an Introduction to Biology class at the prison. Courtesy of Linn Lee hide caption

itoggle caption Courtesy of Linn Lee

Newark Mayor Cory Booker and Facebook CEO Mark Zuckerberg in Newark, N.J., last fall. Zuckerberg donated $100 million to improve local schools, but some are worried the money will be funneled to the wrong places. Gary He/insiderimages hide caption

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