It’s twenty years since the US and UK invaded Iraq to overthrow Saddam Hussein. Kirsty Wark discusses the lead up to the war, the impact on the lives of Iraqis and the legacy.Ghaith Abdul-Ahad left his job in Baghdad and became a journalist during the Iraq War in 2003. He witnessed first-hand the liberation of his country from a megalomaniac leader and then its descent into factionalism and violence. In A Stranger In Your Own City he movingly recounts the very real human cost of the invasion, as well as the civil wars and rise of ISIS that followed. Emma Sky volunteered to help rebuild Iraq post-invasion and went on to serve as the representative of the Coalition Provisional Authority in Kirkuk and then as a political advisor to the US army in the following decade. Now an academic at Yale University, she looks back at why the Iraq invasion failed and its implications across the region. She's the author of The Unravelling and In a Time of Monsters: Travelling in a Middle East in Revolt.The BBC’s Security correspondent Gordon Corera was a young reporter during the frenetic build up to the war, talking to spies, defectors and politicians. In a 10-part series – Shock and War: Iraq 20 Years On (from 13th March at 1.45 and on BBC Sounds) – he talks to those at the centre of that decision to go to war, and looks at the far-reaching consequences, from trust in politics, security and liberal intervention.Producer: Katy Hickman

It’s Ok To Be Angry About Capitalism is the title of the new book by the US politician Bernie Sanders. In it he castigates a system that he argues is fuelled by uncontrolled greed and rigged against ordinary people. He tells Tom Sutcliffe it’s time to reject an economic order and a political system that continues to benefit the super-rich, and fight for a democracy that recognises that economic rights are human rights.The Chief Economics Commentator at the Financial Times Martin Wolf looks more closely at how and why the relationship between capitalism and democracy appears to be unravelling. But despite the failings – slowing growth, growing inequality and widespread popular disillusion – he argues in The Crisis of Democratic Capitalism that the relationship remains the best system for human flourishing. But the economist Kate Raworth believes that mainstream economics has had its day. Its failure to predict and prevent financial crises, while allowing extreme poverty, inequality and environment degradation to persist, means its contributing to, not solving, societal unrest. She argues that her theory – Doughnut Economics – offers a new model for a green, fair and thriving global economy.Producer: Katy Hickman

The theoretical physicist Carlo Rovelli celebrates the life of an ancient Greek philosopher, in Anaximander And The Nature Of Science (translated by Marion Lignana Rosenberg). He tells Adam Rutherford that this little known figure spearheaded the first great scientific revolution and understood that progress is made by the endless search for knowledge. Anaximander challenged conventions by proposing that the Earth floats in space, animals evolve and storms are natural, not supernatural.The travel writer Kapka Kassabova has gone searching for ancient knowledge about the natural world in her latest book, Elixir: In the Valley at the End of Time. The Mesta River, in her native Bulgaria, is one of the oldest inhabited rivers in Europe, and a mecca for wild plant gatherers, healers and mystics. In Dvořák’s lyric opera the eponymous hero Rusalka is a water spirit who sacrifices her voice and leaves her home for the love of a Prince. In a new contemporary staging at the Royal Opera House (21 February–7 March 2023) the co-directors Ann Yee and Natalie Abrahami foreground the uneasy relationship between nature and humanity, and the latter's destruction of what it fails to heed.Producer: Katy HickmanImage credit: Asmik Grigorian in Natalie Abrahami and Ann Yee’s Rusalka, The Royal Opera ©2023 Laura Stevens

The psychologist Kimberley Wilson lays bear the truism ‘we are what we eat’. In Unprocessed: How the Food We Eat is Fuelling our Mental Health Crisis she bring into sharp focus the known links between diet, brain, behaviour and mental health. She tells Tom Sutcliffe how the government’s failure to address poor nutrition is a catastrophe.Rebecca O’Connell’s research focuses on the social, cultural and economic reasons that shape what children and families eat, and the part food plays in their everyday lives. With the cost of living crisis and an increase in families suffering food poverty, she looks at the capacity to ‘choose’ to buy healthier food, and what other countries, like Portugal, have achieved in prioritising school meals. But what about the food itself and how it’s grown? The author of The Ethical Carnivore, Louise Gray, turns her attention to fruit and veg in her latest book, Avocado Anxiety And Other Stories About Where Your Food Comes From. Tracking from farm to table, Gray discovers the impact that growing fruits and vegetables has on the planet.Producer: Katy Hickman

Shakespeare’s Lady Macbeth is ruthless in her pursuit of power and then driven into madness and despair. But the writer and director Zinnie Harris has re-imagined a new story for Lady Macbeth in her version of this classic play. Macbeth (an undoing) - published by Faber - is on at The Lyceum Theatre in Edinburgh until 25th February.Marion Gibson is Professor of Renaissance and Magical Literatures at the University of Exeter and is interested in how power and superstition collide in witch-trials through the centuries. In her latest book, The Witches of St Osyth, she tells the story of the sixteen women and one man accused of sorcery in a small rural village in 1582, and of a community devastated by violence and betrayal.The filmmaker Jo Ingabire Moys draws from her own experience of surviving the Genocide in Rwanda in her short film Bazigaga, shortlisted for a BAFTA. As violence erupts a Tutsi pastor and his young daughter take shelter in the home of the feared shaman Bazigaga. The film was inspired by the true story of Zura Karuhimbi who used her reputation as a witch doctor to save hundreds of lives.Producer: Katy HickmanImage: The actor Eliane Umuhire in 'Bazigaga', written and directed by Jo Ingabire Moys

Tom Sutcliffe talks to three historians about the crimes of WWII and the shifting geopolitics, and the lasting reverberations today with the war in Ukraine. Dan Stone’s new book, The Holocaust - An Unfinished History moves beyond the concentration camps to reveal the true extent of the killing in towns and villages, and the depth of collaboration across the continent – from Norway to Romania. On BBC World Service and BBC Sounds Catherine Merridale uncovers the complex story of loss and silence about the murder of Soviet Jews during the Nazi invasion in 1941, and the extraordinary testimony of what was happening, detailed in The Black Book. Bernard Wasserstein’s family originally came from Krakowiec and in A Small Town in Ukraine he traces the arc of history across centuries of religious and political conflict through the fortunes of its inhabitants – from the earlier invasions of Cossaks, Turks and Swedes to the horrors of WWII and today’s war with Russia. Producer: Katy HickmanImage: Three Jewish women gather their belongings on Haifa dock, Palestine, after leaving the illegal immigrant ship Exodus. (Getty Images)

The architect Sandra Youkhana takes readers on a tour of the structures of modern digital worlds in Videogame Atlas (co-authored with Luke Caspar Pearson). From Minecraft to Assassin’s Creed Unity she examines the real-world architectural theory that underpins these fantasy worlds, and their influence on concrete designs today.The journalist Louise Blain presents BBC Radio 3’s monthly Sound of Gaming which showcases the latest and best gaming soundtracks. She explores how composers help create not only the atmosphere in a game, immersing players in these invented worlds, but their music is also integral to the game’s structure and design. Adrian Hon spent a decade co-creating the hit game Zombies, Run but has become increasingly disillusioned with the way real world institutions – corporations, governments and schools – are using gamification to monitor and control behaviour. In You’ve Been Played he shows how the elements of game playing have been co-opted as tools for profit and coercion.Producer: Katy HickmanImage Credit: Map of the game 'Katamari Damacy' by Sandra Youkhana and Luke Caspar Pearson from 'Videogame Atlas: Mapping Interactive Worlds'

From Europe’s perspective Christopher Columbus ‘discovered’ America in 1492. But the historian Caroline Dodds Pennock shifts the focus in her new book, On Savage Shores, to explore what the great civilisations of the Americas – the Aztecs, Maya, Totonacs, Inuit and others – found in return. The stories of Indigenous Americans abroad are ones of abduction, loss and cultural appropriation, but also bafflement at the lives and beliefs in 15th century Europe. On Savage Shores is BBC Radio 4's Book of the Week.Iokiñe Rodríguez Fernandez is a Venezuelan sociologist who co-founded Grupo Confluencias, a consortium of Latin American conflict resolution practitioners. She works closely with indigenous communities who are fighting to retain their ways of life, and the focus is very much on local history, local knowledge and traditions. The Royal Academy of Arts in London is showcasing treasures from Spain and the Hispanic World from 21st January. This landmark exhibition will present a visual narrative of the history of Spanish culture, bringing together works from Spain and from its colonies in Latin America, from antiquity to the early 20th century. The co-curator Adrian Locke explains how the artistic, cultural and religious influences from abroad helped shape and enrich art in Spain.Producer: Katy Hickman

In Not So Black and White: A History of Race from White Supremacy to Identity Politics Kenan Malik questions what he sees as lazy assumptions about race and culture. He retells the forgotten history of a racialised working class which sits uncomfortably with today’s obsession with ‘white privilege’. He tells Tom Sutcliffe that we need to confront the issues facing society in terms of class and inequality, and not in terms of identity. The academic Francesca Sobande believes people’s racial identity is a key factor in their experiences and how they are treated. Black Oot Here, co-authored with layla-roxanne hill, explores the history and contemporary lives of Black people in Scotland. The prize winning poet Don Paterson grew up on a working-class council housing estate in Dundee in Scotland. He looks back at that time in his memoir, Toy Fights, interweaving the moments of love, joy and musical delight with the dark side of growing up surrounded by poverty.Producer: Katy HickmanImage credit: '40 George Square' by Francesca Sobande

The award-winning social psychologist Dacher Keltner believes he’s found the answer to happiness: finding awe. In his new book, Awe: The Transformative Power of Everyday Wonder, he shows how this elusive, but powerful, emotion can have physical and psychological effects, impacting our bodies and brains. Anna Lapwood is an organist and conductor, and currently the Director of Music at Pembroke College, Cambridge. She is also a great believer in the transformative power of music. She regularly plays the Royal Albert Hall’s organ – described as ‘the voice of Jupiter’ – and believes listeners can feel the wonder vibrating through the music.Looking up at the night sky and contemplating galaxies far away is often seen as a sure way to elicit wonder, but the physicist Felix Flicker argues that it can be found much smaller and much closer to home. In The Magick of Matter he shows how truly inspiring crystalline specks of dust can be, and when they're combined the sky’s the limit.Producer: Katy HickmanImage: Anna Lapwood - Leeds Town Hall (Credit Tom Arber)