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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 of wars across the world from chemical warfare to cyber-attacks. She looks ahead to the major conflicts to watch in the coming year.The above image is from the British Museum’s exhibition I Am Ashurbanipal: King of the World, King of AssyriaProducer: Katy Hickman

Andrew Marr starts the year in search of happiness with the behavioural scientist and happiness professor Paul Dolan. Dolan has advised the government on how to measure wellbeing, and in his latest book Happy Ever After argues that we’ve been sold a lie about the sources of happiness. The route to fulfilment may be far more unexpected that we thought.The writer Laura Freeman deplores what she calls the current Pollyana tendencies to ‘keep smiling’ via the mood-tracker apps on your phone. Freeman recounts how she herself found an appetite for life, after years of suffering with anorexia, through her love of reading.The science journalist Linda Geddes explores the impact of sunlight on our minds and bodies. In Chasing the Sun she looks at its significance in improving our health, sleep, productivity and mood.But what if our mood is really affected not by our mind, but our bodies? Professor Edward Bullmore has studied the link between mental health and physical inflammation, and argues that we need to look more closely at our immune system in the treatment of depression.Producer: Katy Hickman

On Christmas Eve, Andrew Marr explores the mysteries of snow and ice. Michelle Paver's novels dwell in the darkest places: an Arctic hut in midwinter haunted by ghosts, an isolated mountain peak, and a prehistoric frozen forest. She explains the appeal of these inhospitable settings, and asks why the cold still terrifies us.Ben Saunders knows the sounds and smells of ice better than most. As one of the world's leading polar explorers he has skied to the North Pole and completed Scott and Shackleton's aborted trip to the South Pole. He describes the exhaustion, frustration and wonder of life on a frozen sea.Materials scientist Mark Miodownik knows that liquids are not to be trusted, even when frozen solid. His latest book, Liquid: The Delightful and Dangerous Substances That Flow Through Our Lives, unpicks the cracks, creaks and crystals of ice.Poet and writer Nancy Campbell set out from the world's northernmost museum to understand our fascination with ice and snow. Her new book, The Library of Ice: Readings from a Cold Climate,brings to life the people who dwell in these icy landscapes, many of which are now disappearing.Producer: Hannah Sander