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Page last updated at 10:03 GMT, Thursday, 11 February 2010

Pivotal moments 'have a picture'

Are our most memorable moments of history the most important? Nelson Mandela's release from prison 20 years ago today is seen by many as on of the most memorable events of recent times but others would argue that more important in changing the course of South Africa was FW De Klerk's rejection of apartheid.

Dame Ann Leslie, former foreign correspondent, and Juliet Gardiner, historian and author of The Thirties, an intimate history, discuss what makes a memorable image.

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