A shopper walks past a sign advertising a shop that sells commemorative coins with the face of Nelson Mandela in the Sandton City shopping centre in Johannesburg, South Africa Tuesday,

 

              A shopper walks past a sign advertising a shop that sells commemorative coins with the face of Nelson Mandela in the Sandton City shopping centre in Johannesburg, South Africa Tuesday,
A shopper walks past a sign advertising a shop that sells commemorative coins with the face of Nelson Mandela in the Sandton City shopping centre in Johannesburg, South Africa Tuesday, June 11, 2013. Doctors are doing all they can to improve Nelson Mandela's health as the 94-year-old icon spent a fourth day in the hospital for a recurring lung infection, South Africa's president said Tuesday, as two of Mandela's daughters visited their father. (AP Photo/Ben Curtis)