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Amol Rajan discusses the uneasy interaction between the animal kingdom and humans. The anthropologist Alice Roberts looks back to the moment hunter-gatherers changed their relationship with other species and began to tame them, paving the way for our civilisation. Gaia Vince visits the Pacific Coast of Costa Rica where local people have found a way to both exploit and protect a natural resource, the olive ridley sea turtle. Re-introducing native species can be fraught with difficulties: John Ewen was part of the team who successfully re-introduced the hihi bird to New Zealand, but can lessons learnt with songbirds help with schemes to bring back wolves, lynx and beavers? And resurrection science may be the stuff of films like Jurassic Park, but it is also an exciting - and potentially dangerous - new field of study. Britt Wray offers a warning about the risks of de-extinction.Producer: Katy Hickman.

Are humans distinguished not just by a capacity to think, but by our need to believe - where the search is not so much for my place in the world, but for our place in the cosmos? Neil MacGregor, the former Director of the British Museum, discusses Living with the Gods, his Radio 4 series, in which he focuses on the expression of shared beliefs, across thousands of years, and around the globe, through objects from the Museum's collections and beyond. The curator Jennifer Sliwka looks at a world in black and white, in a celebration of the monochrome in art across the centuries, from medieval sacred works, where the elimination of colour was thought to focus the mind, to contemporary paintings. The historian Dan Jones tells the story of the ultimate holy warriors, the Knights Templar, a story of power, politics and fanaticism. The writer Caspar Henderson takes a step back to consider the awe-inspiring - from divine visions to transcendent moments - and to ask whether we are in danger of losing our sense of wonder in the modern world. Presenter Andrew Marr Producer Katy Hickman Photograph: (c) The Trustees of the British Museum.

War became illegal in 1928 with the Paris Peace Pact that created a new world order, according to the lawyer and academic Oona Hathaway. She tells Andrew Marr how this pivotal moment launched a new international system in which sanctions replaced gunboat diplomacy. Although inter-state wars have fallen since World War Two, intra-state conflicts have risen: Elisabeth Kendall explains the dire situation of one of the Arab's poorest countries, Yemen. The Norwegian ambassador to the UK Mona Juul talks about the art of international diplomacy. She played a key role in the secret talks which led to the Oslo Accords in the 1990s - the first ever agreement between Israel and the Palestine Liberation Organisation. And Phillip Collins looks at the speeches that have shaped the world and inspired generations, especially at moments of war and conflict. Producer: Katy Hickman.