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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

Kirsty Wark explores national stories and myths – from both inside and outside a country’s borders.Neil MacGregor discusses how Dickens, Monty Python and the Suez Crisis have influenced the way Britain is perceived abroad. He visits five different countries to find out which historical events, cultural influences and objects have shaped the way how others see us. The answers may well surprise people back home. Sweden has a strong sense of its own national identity: it boasts the world’s oldest free press and prides itself on its special brand of social democracy. But the journalist Kajsa Norman looks beyond this utopian myth to expose the darkness in the Swedish soul. She reveals what happens to those who dare to dissent from consensus.Japan’s national image abroad is one of staid tradition mixed with bizarre pop culture, and the samurai warrior alongside the grey mass of ‘salarymen’. But the academic Christopher Harding argues there is far more to Japanese society than these enduring clichés. He looks at how Japan has been reinventing itself over the last century and a half, and the often radical and outspoken resistance to conformity.Producer: Katy Hickman