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The prize-winning writer John Lanchester considers the political endgame of a fractious world in his new novel, The Wall. He tells Amol Rajan why he has written a dystopian fable in which the young distrust the old, and the world appears broken.But just how violent are we as a species? The primatologist Richard Wrangham believes there is a 'goodness paradox': at an individual level we have evolved to become a more peaceful animal, especially compared to our closest relatives, the chimpanzee; but our ability to organise and plan an attack has made us lethal.The ancient Assyrians celebrated every detail of cruelty, massacre and torture, including skinning prisoners alive, as they built their empire and conquered their enemies. The academic Eleanor Robson looks back at the reign of the King Ashurbanipal from the 7th century BC, immortalised in an exhibition at the British Museum.Shortly after the King’s death the Empire fell. Dr Patricia Lewis is an expert on international security and studies the ebb and flow