The Nelson Mandela Foundation is hoping that volunteers around the world will donate 67 minutes of their time when South Africa's former president turns 95 on 18 July 2013.
Mandela remained hospitalised in critical but stable condition for a recurring lung infection from 8 June 2013.
The foundation's Twitter feed is asking people to join in the volunteer-day initiative. The Twitter feed often shares quotes from the man who spent 27 years in prison during white racist rule in South Africa.
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