About 40 percent of high schools start before 8 a.m., which contributes to chronic sleep deprivation among teens, according to the American Academy of Pediatrics. Chris Waits/Flickr hide caption

itoggle caption Chris Waits/Flickr

Inmates from several Alabama state prisons take a math class at J.F. Ingram State Technical College. The campus becomes a medium-security facility when the students arrive. Dan Carsen/WBHM hide caption

itoggle caption Dan Carsen/WBHM

Teachers with the Jennings School District pick up trash Tuesday on West Florissant Avenue in Ferguson, Mo., the scene of nightly police clashes. Jennings and the neighboring Ferguson school district have canceled class due to ongoing unrest. Elise Hu/NPR hide caption

itoggle caption Elise Hu/NPR

A graphic released with the 2012 PISA results shows the annualized change in performance in average math scores between 2003 and 2012. The chart includes only nations that have comparable data from both 2003 and 2012. PISA hide caption

itoggle caption PISA

Hazel Avery, 86, holds her iPad for the first time. The Connecting to Community program, with funding from the AARP Foundation, teaches low-income seniors how to increase social engagement online. The Washington, D.C., program chose seniors with no previous computer experience. Sarah L. Voisin/The Washington Post/Getty Images hide caption

itoggle caption Sarah L. Voisin/The Washington Post/Getty Images