A man in Nairobi, Kenya, stands in front of a mural of President Obama, created by the Kenyan graffiti artist Bankslave, ahead of Obama's trip to Kenya and Ethiopia. Ben Curtis/AP hide caption

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Courtesy of Corinne Purtill and Mark Oltmanns

President Obama meets Cuban President Raul Castro at the Summit of the Americas in Panama City on April 11. The White House says it wants to remove Cuba from its list of state sponsors of terrorism. Pablo Martinez Monsivais/AP hide caption

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Two teams face off in a debate over the extent of the president's war powers at the latest debate from Intelligence Squared U.S. Samuel LaHoz/Intelligence Squared U.S. hide caption

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Students gather at a distance from the Garissa University College after an attack by gunmen in Garissa, Kenya, Thursday. The attack has injured dozens of people; a siege is ongoing. AP hide caption

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A lynching attended by a large mob. Courtesy of the Library of Congress hide caption

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Courtesy of Liveright Publishing

Alberto Nisman, the prosecutor investigating the 1994 bombing of the Argentine-Israeli Mutual Association community center, talks to journalists in Buenos Aires, Argentina, in 2013. Nisman was found shot dead in his apartment on Sunday. Natacha Pisarenko/AP hide caption

itoggle caption Natacha Pisarenko/AP

World leaders, including, from the left, Israel's Prime Minister Benjamin Netanyahu, Mali's Ibrahim Boubacar Keita, France's Francois Hollande, Germany's Angela Merkel, EU President Donald Tusk and Palestinian President Mahmoud Abbas march in Paris on Sunday to honor the victims of three days of bloodshed. A White House spokesman acknowledged "we should have sent someone with a higher profile." Philippe Wojazer/AP hide caption

itoggle caption Philippe Wojazer/AP