Wednesday

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The Mathare Valley, shown here in an aerial map, is one of the largest and oldest slums in Nairobi, Kenya. Residents are using hand-held GPS devices to map the area, which comprises 13 villages and is home to nearly 200,000 people. Courtesy of Muungano Support Trust and Jason Corburn, UC Berkeley hide caption

toggle caption Courtesy of Muungano Support Trust and Jason Corburn, UC Berkeley
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Monday

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President Obama applauds as former first lady Barbara Bush and former President George W. Bush help President George H.W. Bush stand at the opening ceremony of the George W. Bush Presidential Library on April 25 in Dallas. Former first lady Laura Bush looks on. Kevork Djansezian/Getty Images hide caption

toggle caption Kevork Djansezian/Getty Images
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Tuesday

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