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Anne McElvoy explores the roads not taken with the historian Richard Evans. Counterfactual history began as an Enlightenment parlour game and has become a serious academic pursuit, but Evans argues against endless speculation as to what might have been. The final meeting between Lawrence of Arabia and Faisal I of Iraq was an anti-climax which belied their history. The biographers of these two leaders, Scott Anderson and the former Iraqi politician Ali Allawi, place these men at the centre of the making of the modern Middle East. The writer Malu Halasa offers an alternative view of the violent events in Syria as she curates a book of political posters, comic strips, blogs and plays.Producer: Katy Hickman.

Tom Sutcliffe discusses how we make decisions with the Nobel prize-winning psychologist Daniel Kahneman. Moral choices in politics can be a complicated business, according to the academic and former politician Michael Ignatieff, who explores whether the age of international intervention is over. Doctors work under the oath 'do no harm', but the neurosurgeon Henry Marsh says the decision whether to operate on a brain is rarely that simple. High emotion can cloud your judgement and the writer Lisa Appignanesi looks back at sensational crimes of passion to ask how far the perpetrators were responsible for their actions.Producer: Katy Hickman.

Tom Sutcliffe talks to Andrew Hussey about the often fraught relationship between France and its Arab ex-colonies, and how that plays out in the banlieues of Paris. The psychotherapist Gabrielle Rifkind recounts her experience of conflict resolution in the Middle East. While Rifkind emphases the need to understand what's happened in the past, the writer Ziauddin Sardar tries to imagine what the world would be like if we explored the future in a more systematic and scientific way.Producer: Katy Hickman.