A Meeting Of Great Minds: During his 1966 visit to South Africa, Sen. Robert F. Kennedy met with anti-apartheid activist Chief Luthuli and later spoke publicly about their meeting. Because of a government ban on media coverage of Luthuli, it was the first news many had of their leader in more than five years. Shoreline Productions hide caption

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President Obama looks out the window of the Robben Island prison cell that once held Nelson Mandela. The president and his family visited the prison on Sunday. Gary Cameron /Reuters /Landov hide caption

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Friday in Pretoria, South Africa, people gathered outside a hospital to pray for former President Nelson Mandela. He remains in critical condition with a lung infection. Jeff J. Mitchell/Getty Images hide caption

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Children release 95 balloons to mark Nelson Mandela's upcoming birthday outside the Mediclinic Heart Hospital where Mandela is being treated for a recurring lung infection in Pretoria, South Africa. Chip Somodevilla/Getty Images hide caption

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A message for "Dear Tata" (Nelson Mandela) outside the hospital in Pretoria where he is being treated. Alexander Joe /AFP/Getty Images hide caption

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Prayers for Nelson Mandela: At Regina Mundi church in Soweto township, South Africa, on Sunday, congregants prayed for the former South African leader. Dai Kurokawa /EPA /LANDOV hide caption

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A Vietnamese rhino horn user displays her horn, which was a gift from her well-to-do sister. Last year, rhino horn sold for up to $1,400 an ounce in Vietnam, about the price of gold these days. Frank Langfitt/NPR hide caption

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South Africa's Oscar Pistorius competing during the London 2012 Paralympic Games. Glyn Kirk /AFP/Getty Images hide caption

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BRICS leaders, from left, Indian Prime Minister Manmohan Singh, Chinese President Xi Jinping, South African President Jacob Zuma, Brazil's President Dilma Rousseff and Russian President Vladimir Putin pose for a group picture during the BRICS 2013 Summit in Durban, South Africa, on Wednesday. Sabelo Mngoma/AP hide caption

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A shopper at a branch of South African retailer Pick n Pay in Johannesburg. Health insurer Discovery offers rebates on health food at the chain to its members who enroll in a health promotion program. SIPHIWE SIBEKO/Reuters /Landov hide caption

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