The Iraqi army left behind equipment, including body armor and vehicles, as Sunni militants overran the northern city of Mosul earlier this month. Safin Hamed/AFP/Getty Images hide caption

U.S. Education Secretary Arne Duncan says states must ensure progress for students with disabilities. Andrew Burton/Getty Images hide caption

A jury of 9th-graders is sworn in at a "teen court" session in Michigan. Jennifer Guerra/Michigan Radio hide caption

Linc Energy has installed 44 monitoring wells at its proposed test site near Wright, Wyo., to establish baseline water quality. Stephanie Joyce for NPR hide caption

Aaron Carapella, a self-taught mapmaker in Warner, Okla., has designed a map of Native American tribes showing their locations before first contact with Europeans. Hansi Lo Wang/NPR hide caption

Glenn Dicterow joined the New York Philharmonic as its concertmaster in 1980. He has performed as its soloist every year since. Chris Lee/Courtesy of the artist hide caption

The Armatix smart gun is implanted with an electronic chip that allows it to be fired only if the shooter is wearing a watch that communicates with it through a radio signal. It is not sold in the U.S. Michael Dalder/Reuters/Landov hide caption

Sen. Mary Landrieu, D-La., talks with her father, former New Orleans Mayor Moon Landrieu, on Feb. 1. The two appear together in recent television ads for her re-election campaign. Gerald Herbert/AP hide caption

David Aaron Carpenter plays the 'Macdonald' Stradivarius viola at Sotheby's auction house for NPR in April. Manya Zuba/NPR hide caption

Mississippi Freedom Democratic Party delegates and supporters stage a demonstration on the boardwalk in front of the Atlantic City Convention Center in 1964. Courtesy of George Ballis/Take Stock hide caption