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JOHANNESBURG, SOUTH AFRICA - JULY 18: Schoolchildren sing 'Happy Birthday' to former South African President Nelson Mandela at Phefeni High School, opposite Mandela's former home in Soweto Township on July 18, 2013 in Johannesburg, South Africa. The South African presidency has said that Mandela's health is 'steadily improving', as the anti-apartheid icon spends his 95th birthday in hospital. Children in schools across the country have started off Mandela Day by singing 'Happy Birthday' to him. (Photo by Christopher Furlong/Getty Images)
JOHANNESBURG, SOUTH AFRICA - JULY 18: Schoolchildren sing 'Happy Birthday' to former South African President Nelson Mandela at Phefeni High School, opposite Mandela's former home in Soweto Township on July 18, 2013 in Johannesburg, South Africa. The South African presidency has said that Mandela's health is 'steadily improving', as the anti-apartheid icon spends his 95th birthday in hospital. Children in schools across the country have started off Mandela Day by singing 'Happy Birthday' to him. (Photo by Christopher Furlong/Getty Images)

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    South Africa celebrates Mandela's 95th

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South Africa celebrates Mandela's 95th

CNN's Robyn Curnow reports from Pretoria, where crowds have gathered to celebrate Nelson Mandela's 95th birthday.

South Africa celebrates Mandela's 95th

CNN's Robyn Curnow reports from Pretoria, where crowds have gathered to celebrate Nelson Mandela's 95th birthday.