President Obama President Obama

The Japanese supercomputer K, pictured in June 2012 at the RIKEN Advanced Institute for Computational Science in Kobe, western Japan. The K computer is currently ranked No. 3 on a list of the 500 fastest supercomputers. Kyodo/Landov hide caption

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Kyodo/Landov

President Obama and his delegation stand Monday during a welcome ceremony with Ethiopia's Prime Minister Hailemariam Desalegn at the National Palace in Addis Ababa, Ethiopia. Tiksa Negeri /Reuters /Landov hide caption

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Tiksa Negeri /Reuters /Landov

A supporter waves a Cuban flag in front of the country's embassy after it reopened for the first time in 54 years on July 20 in Washington, D.C. The embassy was closed in 1961 when U.S. President Dwight Eisenhower severed diplomatic ties with the island nation after Fidel Castro took power in a communist revolution. Mark Wilson/Getty Images hide caption

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Mark Wilson/Getty Images

Workers finish installing a billboard showing Kenya's President Uhuru Kenyatta and President Barack Obama in downtown Nairobi a day before Obama's visit. Ben Curtis/AP hide caption

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Ben Curtis/AP

Obama's Roots A Source Of Pride — And Discord — In Kenya

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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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Ben Curtis/AP

Iran's Supreme Leader Ayatollah Ali Khamenei delivers a sermon during morning prayers for the Eid al-Fitr holiday, marking the end of the holy month of Ramadan. He signaled his approval of the nuclear agreement with Western powers but reiterated that Tehran's policy toward the "arrogant" United States would not change. Reuters/Landov hide caption

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Reuters/Landov

Is Obama Finally Becoming The President African-Americans Wanted?

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President Obama joins comedian Bill Cosby and others to sing "Happy Birthday" to Sen. Edward M. Kennedy, D-Mass., on March 8, 2009, at The John F. Kennedy Center for the Performing Arts in Washington, D.C. Haraz N. Ghanbari/AP hide caption

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Haraz N. Ghanbari/AP