Katty Kay in Washington and Christian Fraser in London return to report on the events that are shaping the world.

Dr Helen Czerski looks at the anatomy of an avalanche, from eyewitness footage from within one to detailed CT scans showing the microscopic changes that cause them. Show more

Simon Sebag Montefiore uncovers the central role played by religion in the power of the city of Rome. Every event in ancient Rome revolved around religion. Show more

Alice Roberts shows how the Vikings' story has changed on TV since the 1960s, from being seen as brutal barbarians, to pioneering traders able to integrate into multiple cultures. Show more

A Storyville documentary following a 52-year-old Hungarian woman who has been kept by a family as a domestic slave for ten years. Eventually she gathers courage to plan her escape. Show more

Series exploring topical scientific issues. The programme examines how the nine months you spend in the womb could have more lasting effects than lifestyle or genes. Show more

Julie Walters narrates the extraordinary story of Sue Townsend, a working-class woman who achieved literary stardom through sheer talent and an irrepressible will to write. Show more

Documentary in which Ifor ap Glyn reassesses the life and work of Welsh poet Hedd Wyn on the centenary of his death. Show more

Miranda Sawyer meets some of the key female figures of the punk era to look at how they radically changed the cultural landscape and inspired a generation of young women. Show more

Simon Sebag Montefiore uncovers the central role played by religion in the power of the city of Rome. Every event in ancient Rome revolved around religion. Show more