George Hussein Obama, the youngest half-brother of President Obama, in Nairobi, Kenya. Stephen Morrison/epa/Corbis hide caption

Baritone Gerald Finley sings during the premiere of Peter Lieberson's Songs of Love and Sorrow, with the Boston Symphony Orchestra. Michael J. Lutch hide caption

United Nations troops from Bolivia distribute water and meals to the residents of Cite Soleil, Haiti, after the Jan. 12 earthquake. Marco Dormino/Courtesy of U.N. hide caption

U.S. Federal Reserve Chairman Ben Bernanke testifying on Capitol Hill this month about how the U.S. economy still needs the assistance of the Fed. At the end of March, however, the agency plans to stop purchasing mortgage-backed securities. hide caption

Erykah Badu. Paige Parson hide caption

"How do you explain to a 2-year-old or 4-year-old there's nothing to eat?" asks Kathy, a homeless mother. Michael Nye hide caption