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How have the evolutionary forces that shaped animal sex and behaviour influenced the ways humans conserve, study and coexist with other species? As the Zoological Society of London, the precursor to the zoo, celebrates its 200th anniversary, Adam Rutherford is joined by three guests whose work uncovers the scientific, historical and ethical threads connecting humans with the wider animal world. Biologist Lixing Sun introduces his new book On the Origin of Sex - the Weird and Wonderful Science of how our Planet is Populated, uncovering how mating strategies and reproductive behaviour evolved across species. From Californian Condors to clownfish, the dazzling array of ways in which the animal kingdom procreates is both baffling and astonishing.Cultural historian Elsa Richardson, from the University of Strathclyde, discusses her latest research into the archives of Edinburgh Zoo, revealing a rich and little‑known record of early zoological observation, public spectacle and the shifting moral landscapes of how people have imagined, displayed and interpreted animal behaviour.And Sarah Forsyth, Curator of Mammals at ZSL, reflects on the history of the organisation and offers insights into the crucial conservation work that the Zoo is involved in today. From field programmes to breeding initiatives, Sarah explores how modern zoos can help safeguard species and shape our understanding of animals in a rapidly changing world.Producer: Natalia Fernandez Senior Producer: Katy Hickman

What can past and present struggles over work and power tell us about the future of labour? Tom Sutcliffe and guests examine tensions between workers, employers and the state, from the upheavals of the early twentieth century to today’s shifting workplace.Constitutional specialist David Torrance explores the economic, political and social forces that shaped the General Strike of 1926. His new book The Edge of Revolution explains how Britain came to the brink of constitutional crisis and what the confrontation reveals about national identity, political authority and collective action.Professor Jane Holgate, a long time trade unionist and community organiser, reflects on the dynamics of solidarity. She is the co-author of Changemakers, a study of radical strategies for social movement organising, the evolving role of unions, and what effective action looks like in a fragmented modern economy.The Financial Times journalist and editor of the Working It brand Isabel Berwick looks ahead to the future of work, assessing how technology, demographic change and shifting employee expectations are reshaping the workplace.Producer: Katy Hickman Assistant Producer: Natalia Fernandez

How do the stories we inherit, and the ones we tell, shape our journey from childhood into adulthood? In Radio 4's weekly discussion programme, Naomi Alderman and guests examine the shifting boundaries between youth, experience and societal expectation across memoir, history and fiction.Booker Prize winner David Szalay talks about Flesh, his stark, propulsive novel tracing one boy’s path from adolescence in Hungary to adulthood among London’s super rich, exploring desire, power, class and the ways childhood experiences reverberate across a lifetime. Filmmaker and writer Penny Woolcock grew up in a British enclave in Argentina. Her coming-of-age memoir, The Man Who Gave Me a Biscuit: Love and Death in Argentina, interweaves memories of teenage rebellion with the buried histories of genocide, authoritarianism and a society built on repression. The historian Laura Tisdall discusses We Have Come to Be Destroyed, her vivid account of growing up in Cold War Britain, revealing how young people challenged the world adults made for them - from activism and anxieties about the future, to everyday resistance against narrow expectations.Producer: Katy Hickman Assistant Producer: Natalia Fernandez