Chinese President Xi Jinping, center, and Asian leaders approved an agreement on the Asian Infrastructure Investment Bank in Beijing in Oct., 2014. European countries are beginning to sign up too. Takaki Yajima/AP hide caption

itoggle caption Takaki Yajima/AP

President Barack Obama and first lady Michelle Obama unveiled the Let Girls Learn program at the East Room of the White House on Tuesday. Chip Somodevilla/Getty Images hide caption

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David Hermlin is a singer, dancer, musician and songwriter — oh, and a global activist, too. Sample lyric: "I will fight for my dream, and I will never give up." Courtesy of David Hermlin hide caption

itoggle caption Courtesy of David Hermlin

Random violence in Syria makes it a dangerous place for aid workers. This month, members of the Syrian Arab Red Crescent transported Syrians from a rebel area to a part of Aleppo controlled by the Assad regime. Baraa Al-Halabi/AFP/Getty Images hide caption

itoggle caption Baraa Al-Halabi/AFP/Getty Images

They're members of the global-minded teens club: (left to right) Toluwanimi Sola-Adeyemi of Lagos, Chloe McGill of Seattle and Emine Arcasoy of Chapel Hill. Courtesy of Tolu Sola-Adeyemi, Chloe McGill and Emine Arcasoy. hide caption

itoggle caption Courtesy of Tolu Sola-Adeyemi, Chloe McGill and Emine Arcasoy.

John Mayer sings to tens of thousands at the 2013 Global Citizen Festival in Central Park. The event is part of an effort to end extreme poverty. Stephen Lovekin/Getty Images hide caption

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Haley Nordeen, 19, is spending the entire summer at the Prodesenh center in San Mateo Milpas Altas, Guatemala. The American University student helped build the center's new library. Carrie Kahn/NPR hide caption

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Fishermen drag a net in Lake Malawi in 2012. About the size of New Jersey, the lake is home to hundreds of fish species and is considered one of the most biologically diverse lakes in the world. Ding Haitao/Xinhua/Landov hide caption

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A boy collects water at a new spigot in Shululu, Tajikistan. Before the government built a new water system, villagers were allocated half-hour time slots to collect water from a trickling tap. Jason Beaubien/NPR hide caption

itoggle caption Jason Beaubien/NPR