Christopher Knight, 47, has been charged with stealing food and other items from a camp in Rome, Maine. Knight's years of living in isolation earned him the nickname of the North Pond Hermit. Kennebec County Sheriff's Office/AP hide caption

itoggle caption Kennebec County Sheriff's Office/AP

In this photo provided by the Newtown Bee, Connecticut State Police lead children from the Sandy Hook Elementary School in Newtown, Conn., following a shooting there Friday. Shannon Hicks/Newtown Bee/AP hide caption

itoggle caption Shannon Hicks/Newtown Bee/AP

People wanted by the police in Pottstown, Pa., are displayed on the Pinterest page of a local newspaper. The police department's social media strategy, which aims to get the images of criminals seen by more people, has also been adapted in Philadelphia. Pinterest hide caption

itoggle caption Pinterest

At least for one day and night, the city that never sleeps was peaceful. Eduardo Munoz /Reuters /Landov hide caption

itoggle caption Eduardo Munoz /Reuters /Landov

Former Bolingbrook, Ill., police Sgt. Drew Peterson, seen here May 8, 2009, was found guilty Thursday of killing his third wife. M. Spencer Green/AP hide caption

itoggle caption M. Spencer Green/AP

Many in the crowd at Sunday evening's memorial service, held outside of the Aurora Municipal Center, held up handmade signs, honoring the shooting victims and the city of Aurora, Colo. Sam Sanders/NPR hide caption

itoggle caption Sam Sanders/NPR

Police gathered at the east entrance of Columbine High School in Littleton, Colo., on April 20, 1999, after two teen students went on a shooting rampage before turning the weapons on themselves. Mark Leffingwell/AFP/Getty Images hide caption

itoggle caption Mark Leffingwell/AFP/Getty Images

In a video by Our Mexico of the Future, child actors play police, criminals and other adult roles, with the goal of highlighting the challenges facing Mexico. Nuestro Mexico Del Futuro hide caption

itoggle caption Nuestro Mexico Del Futuro

A photo provided by the California Department of Corrections shows killer Charles Manson, 77, on April 4, 2012. AP hide caption

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The arrest of an Occupy DC protester earlier this month in Washington — one type of arrest that would show up in the researchers' numbers. Nicholas Kamm /AFP/Getty Images hide caption

itoggle caption Nicholas Kamm /AFP/Getty Images