Members of the Friendship Nine await a judge's motion to vacate their convictions for trespassing during a sit-in at a South Carolina diner in 1961. Debbie Elliott/for NPR hide caption

Tony Simmons leads a group of Johns Hopkins University students on a "justice walk" in downtown Baltimore, during which they learn about public policy, providing services, and the connections between income inequality and health. Gabriella Demczuk for NPR hide caption

Christian Tengblad (right) and his fellow fare dodger are part of the group Planka.nu. Ari Shapiro/NPR hide caption

Rafael Nadal (right) shakes hands with Tim Smyczek after winning a match at the Australian Open on Jan. 21. Rob Griffith/AP hide caption

A hospital bed is draped with a flag after a veteran died in the hospice ward at St. Albans VA in Queens, N.Y. Quil Lawrence/NPR hide caption

Sen. Chuck Grassley, R-Iowa, speaks during the Freedom Summit on Jan. 24, in Des Moines, Iowa. Charlie Neibergall/AP hide caption

Waze's police reporting tool is one of several features in the app. Users can also share reports of traffic and construction in real time. Courtesy of Waze hide caption

Adam Namm (left) is the U.S. ambassador to Ecuador and a member of Samay Blues Band. He performs regularly with the group and says its a way to breakaway from traditional diplomacy. Alejandro Reinoso for NPR hide caption

Coleen Schaefer (left) and Doni Sprague display a tiger pelt that was confiscated and is being stored at the National Wildlife Property Repository on the outskirts of Denver. Some 1.5 million items are being held at the facility. The Trans-Pacific Partnership, which is still under negotiation, would punish wildlife trafficking. Jackie Northam/NPR hide caption