U.S. first lady Michelle Obama meets children as she visits the Emthonjeni Community Center in Zandspruit Township, Johannesburg, South Africa June 21, 2011. U.S. First Lady Michelle Obama paid a visit to former South African President Nelson Mandela on Tuesday, kicking off her own symbolic trip to Africa by meeting one of the continent’s most revered leaders. REUTERS/Charles Dharapak/Pool (SOUTH AFRICA – Tags: POLITICS SOCIETY)