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It is 50 years since the death of that celebrated icon of cool, Che Guevara, one of the leaders of the Cuban revolution.

Now Che’s younger brother, Juan Martin Guevara - who is in his mid-seventies - has published a memoir, Che, My Brother about life with the revolutionary.

What, if anything, can we learn from the late firebrand of international Marxism at this moment of nationalism and populism?

Stephen Smith has this exclusive report from Buenos Aires.