Impact of the highly improbable.

Nassim Nicholas Taleb talks about his favorite topic on BBC's Start of the Week (podcast available for a limited time);

Samantha Power on the life of UN activist Sergio Vieira de Mello; screenwriter Ronan Bennett discusses his TV series 10 Days to War; novelist Louis de Bernieres on his latest book A Partisan's Daughter; and Nassim Nicholas Taleb talks about the impact of the highly improbable.

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