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A man walks by with a basket of bread during the official presentation ceremony of three new robots that were installed Tuesday in Kinshasa, Democratic Republic of Congo, to help tackle the city's traffic. Federico Scoppa/AFP/Getty Images hide caption

itoggle caption Federico Scoppa/AFP/Getty Images

Fans are celebrating World Book Day on Thursday. Here, a man browses through books at the Albertine, a French bookstore and library at the French Embassy in New York. Jewel Samad/AFP/Getty Images hide caption

itoggle caption Jewel Samad/AFP/Getty Images

Elephant acts at Ringling Bros. and Barnum & Bailey Circus will be phased out by 2018, the circus' parent company said today. The elephants will retire to a conservation center in Polk City, Fla. Tamika Moore/AL.com/Landov hide caption

itoggle caption Tamika Moore/AL.com/Landov

Former Massey Energy Company Chairman and CEO Don Blankenship, seen in July 2010, has pleaded not guilty to conspiracy charges associated with the 2010 West Virginia mine explosion that killed 29 men. Jacquelyn Martin/AP hide caption

itoggle caption Jacquelyn Martin/AP

British filmmaker Leslee Udwin addresses a news conference on her documentary India's Daughter on Tuesday. The film, which has been banned in India, was broadcast Wednesday in the U.K. — a decision that has angered the Indian government. Altaf Qadri/AP hide caption

itoggle caption Altaf Qadri/AP

In this courtroom sketch, Boston Marathon bombing suspect Dzhokhar Tsarnaev is depicted sitting in federal court for a pretrial hearing in Boston on Dec. 18. Tsarnaev is charged with the April 2013 bombing that killed three people and injured more than 260. He could face the death penalty if convicted. Jane Flavell Collins/AP hide caption

itoggle caption Jane Flavell Collins/AP

Andreas Von Knorre (right), one of two German nationals arrested for vandalism in Singapore, arrives in a police car at the state court on Nov. 22, 2014. Both men were sentenced Thursday to a prison term and caning. Roslan Rahman/AFP/Getty Images hide caption

itoggle caption Roslan Rahman/AFP/Getty Images

U.S. Ambassador to South Korea Mark Lippert leaves Sejong Center for the Performing Arts in downtown Seoul, South Korea, after the attack. Yonhap/EPA/Landov hide caption

itoggle caption Yonhap/EPA/Landov