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Students from the Melpark Primary School sing "Happy Birthday" for former president Nelson Mandela as he marks his 95th birthday, during their school assembly, Johannesburg, Thursday, July 18, 2013. South Africa celebrated Nelson Mandela's 95th birthday with acts of charity on Thursday, a milestone capped by news that the former president's health was improving after fears that he was close to death during ongoing hospital treatment. (AP Photo/Denis Farrell)