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The authorities in Argentina say an autopsy has shown no evidence that anyone else was involved in the death of prosecutor Alberto Nisman, who had criticised Argentina's president over a 1994 bombing attack in Buenos Aires.

Also we hear about the Canadian indigenous tribes who've signed up with international partners to get investment for logging - can it be done with cultural sensitivity?

Our regular commentator Lucy Kellaway of the Financial Times has been putting quite a lot of thought into whether workers need to spend more time thinking.

On Martin Luther King Day, we hear from a former Mayor of Atlanta on the murdered civil rights leader's legacy.