Victoria Ruiz (left), a postdoctoral fellow in immunology, works with Brianna Delgado, a high school student that she mentors, at the Blaser Lab, inside NYU's Langone Medical Center in New York, NY. Ramsay de Give for NPR hide caption

itoggle caption Ramsay de Give for NPR

Workers unload medical supplies to fight the Ebola epidemic from a USAID cargo flight in Harbel, Liberia, in August. John Moore/Getty Images hide caption

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A soldier guards a pipe en route to the Kawergosk Refinery near Irbil, the capital of the autonomous Kurdish region of northern Iraq, in July. Fighting in northern Iraq forced the closure of the country's largest oil refinery, Baiji, and cut production from the Kirkuk oil field this summer. Safin Hamed/AFP/Getty Images hide caption

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Army Command Sgt. Maj. Bennie G. Adkins receives the Medal of Honor during a ceremony at the White House. He describes the battle that earned him the medal as the toughest he saw in three tours of duty in Vietnam. Alex Wong/Getty Images hide caption

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Alain Locke is buried at the Congressional Cemetery in Washington, D.C. He lies near many of the nation's early congressmen and next to the first director of the Smithsonian's Museum of African Art. Adam Cole/NPR hide caption

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Cyberstalking victims often don't know they're being tracked through their own phone because spyware apps like mSpy use misleading labels (labeled "android.sys.process" here) and don't take up much data. Aarti Shahani/NPR hide caption

itoggle caption Aarti Shahani/NPR

Minnesota Vikings running back Adrian Peterson, seen here at a practice in late May, has been reinstated after he was benched over alleged child abuse. Andy Clayton-King/AP hide caption

itoggle caption Andy Clayton-King/AP