Even when the weather turns nasty, some students are expected to log on to their classes from home. Magictorch/Ikon Images/Getty Images hide caption

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Dr. Martin Luther King Jr., marches with other civil rights protesters during the 1963 March on Washington. AP hide caption

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Los Angeles Unified School District Superintendent John Deasy, seen in a photo taken last year, says his resignation Thursday was "by mutual agreement." Damian Dovarganes/AP hide caption

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The San Diego School District is sending back a military vehicle it had planned to use in rescue operations. The district had released renderings of what the MRAP might look like after its tan military color is repainted. This version shows it as a police vehicle. San Diego Unified School District hide caption

itoggle caption San Diego Unified School District

At Mother of Sorrows Catholic Church in Murrysville, Pa., on Wednesday evening, worshipers held candles as they prayed for those injured in a stabbing attack at the local high school. Connor Mulvaney /Pittsburgh Post-Gazette/Landov hide caption

itoggle caption Connor Mulvaney /Pittsburgh Post-Gazette/Landov

Emergency responders gather in the parking lot on the campus of Franklin Regional High School in Murraysville, Pa., on Wednesday after an attack there left at least 20 people, nearly all of them students, injured. Most suffered stab wounds or lacerations. Keith Srakocic/AP hide caption

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Uintah Elementary School in Salt Lake City, where up to 40 students were served lunch Tuesday — only to have it discarded. They were told they didn't have enough credit on their accounts. Google hide caption

itoggle caption Google

Very few girls get the recommended 60 minutes of exercise daily. But physical activity could help with school, a study says. evoo73/Flickr hide caption

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Crowdsourcing tools are giving teachers and school district employees more say on big decisions. iStockphoto.com hide caption

itoggle caption iStockphoto.com

All locked up: School buses sat idle this morning in the Jamaica section of New York City. Justin Lane /EPA /LANDOV hide caption

itoggle caption Justin Lane /EPA /LANDOV