The Forum

Nostalgia is one of those complicated emotions: we long to be transported to a place or moment in the past that we have loved but at the same time feel sad that it has gone forever. It is also a bit of a slippery intellectual concept: regarded as a malady when the term was first coined in the 17th century, nostalgia is now thought to be benign or even mildly therapeutic. And beyond personal recollections, business uses it to sell all manner of things and some politicians skilfully deploy it to hide their real objectives. So what actually is nostalgia?Iszi Lawrence explores the past and present of nostalgia with Dr. Agnes Arnold-Forster , author of Nostalgia: A History of a Dangerous Emotion, Prof. Krystine Batcho who devised the Nostalgia Inventory and Dr. Tobias Becker author of Yesterday, A New History of Nostalgia. We also hear WS listeners' views on nostalgia.(Photo: Vintage photographs with a dried rose. Credit: Alicia Llop/Getty Images)

Airports: at their most basic level places to fly from to reach destinations near and far. And yet so much more. Iszi Lawrence and guests take a look at the evolution of airports, from their beginnings as military airstrips to the modern-day behemoths with their luxury shopping outlets, gardens and art galleries.The early European airports were modelled on railway stations, as that was the only blueprint for a transport hub. The public became so enthralled by air travel that airports eventually became popular as destinations in themselves. Airports today are places filled with emotion: the scene of farewells and arrivals, as well as the stress of international travel in an age of terrorism.Iszi is joined by cultural historian Alastair Gordon, author of Naked Airport: A Cultural History of the World's Most Revolutionary Structure; Lilia Mironov, an architectural historian and air steward who wrote Airport Aura: A Spatial History of Airport Infrastructure; and architect and airport planner Su Jayaraman who teaches at the University of Westminster in London. Plus a range of Forum listeners from around the world contribute their personal experiences of airports.Produced by Fiona Clampin for BBC World Service.(Photo: John F. Kennedy International Airport, the TWA Flight Center, terminal 5, designed by Eero Saarinen. Credit: Lehnartz/ullstein bild/Getty Images)

What is the purpose of libraries in the era of the internet and AI? Whether at a school or in a community, libraries used to be key providers of information and enjoyment for many. But now, in a digital age, more books and periodicals are available online than even the biggest library can hold. If terabytes of text can now be stored on a single laptop, do we need to think differently about the way we access and navigate books? Could well-designed AI tools be trusted to make sense of this information abundance in a similar way that a good librarian can?Rajan Datar discusses the past, present and future of libraries with Randa Chidiac, Director of Library Services at the American University in Dubai; Dr. Andrew Hui, Head of Literature Studies at Yale-NUS College in Singapore; and Brewster Kahle, computer engineer and digital librarian, founder of the Internet Archive and Wayback Machine. We also hear from World Service listeners.(Photo: An artist's impression of a digital book. Credit: Alengo/Getty Images)

From Colombia to Vietnam and beyond the US dollar is the currency in which much of international business is conducted and which many people outside the US use as a means of exchange and a store of value. So how did a country with just over 4 percent of the world's population come to dominate global banking and trade? When the position of the US dollar as the linchpin of global commerce was confirmed at the end of the Second World War, not everyone was happy with this state of affairs: the French soon spoke of the Americans having an ‘exorbitant privilege'. Did they have a point? And what of the more recent efforts to replace the Greenback with other currencies? Iszi Lawrence follows the history of the US dollar from its origins to today with H W Brands Jr., Professor of history at the University of Texas at Austin; Barry Eichengreen, Professor of economics and political science at the University of California, Berkeley; Carola Frydman, Professor of finance at the Kellogg School of Management, Northwestern University in Evanston; Perry Mehrling, Professor of international political economy at the Pardee School of Global Studies, Boston University and World Service listeners.[Photo: A roll of US dollar notes. Credit: Getty Images]

Where do charismatic personalities come from? Are they people born with special or even divine gifts? Or have they simply mastered a few effective techniques for cordial social interaction that anyone can learn? As business, entertainment and politics increasingly turn into popularity contests conducted through social media and TV, charisma seems to matter more and more: hence the proliferation of companies offering to teach aspiring leaders how to acquire it. But the influence that magnetic personalities can have on an audience long predates modern screen media: in 1896, a speech brimming with charisma earned one little-known young orator a not just a 20-minute standing ovation but also a US presidential nomination.Iszi Lawrence explores the role of charisma in politics and business with Julia Sonnevend, Associate Professor of Sociology and Communications at The New School for Social Research in New York and author of Charm: How Magnetic Personalities Shape Global Politics; John Antonakis, Professor of Organizational Behaviour in the Faculty of Business and Economics of the University of Lausanne, and co-author of a political charismometer that predicts US presidential elections among other things; Jeremy C. Young, historian of political culture and social movements, author of The Age of Charisma: Leaders, Followers, and Emotions in American Society; as well as World Service listeners.(Photo: Smiling businessman in discussion. Credit: Thomas Barwick/Getty Images)

When the writer Sir Arthur Conan Doyle killed off his most famous literary creation, Sherlock Holmes, readers were so angry that thousands cancelled their subscriptions to the magazine in which the stories appeared. The editor and Conan Doyle himself were overwhelmed with letters from a furious public - fans who instead of accepting the death of their favourite fictional character then started to write and share their own stories featuring Holmes. They eventually formed clubs and appreciation societies, brought together by a common interest.This practice is something we recognise today across the globe. In areas as diverse as sport, music, film and TV (to mention just a few), fans are not just passive consumers as the recent activities of Swifties (Taylor Swift fans) demonstrate. They're actively engaged, creating content of their own and connecting with others to nurture a shared identity. The internet has made that easier than ever before, with fans now using their platform to influence political discourse too.Iszi Lawrence discusses the history and inexorable rise of fandom, with guests Paul Booth, Professor of  Media and Pop Culture at DePaul University in Chicago in the United States; Areum Jeong, Assistant Professor of Korean Studies at Arizona State University in the US and Corin Throsby from the University of Cambridge in the UK, whose research focuses on Romantic literature and early celebrity culture. The programme also includes contributions from Julian Wamble, Assistant Professor of Political Science at George Washington University and the creator of Critical Magic Theory: An Analytical Harry Potter Podcast, and listeners around the world share their fan stories.Produced by Fiona Clampin for the BBC World Service.(Photo: Fans wait to pay for items of merchandise as they visit a pop-up store of South Korean K-pop sensation BTS. Credit: ANTHONY WALLACE/AFP via Getty Images)

Jewellery can enthral us in many ways: it can delight, inspire and uplift us or it can transport us to the place where we acquired it. It can also make us avaricious or jealous. But why? What explains our enduring fascination with shiny metal and colourful stones?Iszi Lawrence is joined by Dr. Emily Stoehrer, Senior Curator of Jewelry at the Boston Museum of Fine Arts and author of several books on American jewellery and fashion; Dr. Petra Ahde-Deal, a Finnish gemmologist and jeweller who currently lectures at the University of Gothenburg in Sweden and at the DIS Study Abroad Program in Copenhagen; Emefa Cole, jewellery maker originally from Ghana who is also the Curator of Diaspora Jewellery at the Victoria and Albert Museum in London; Mansi Rao, Curator of the South Asia Collection in Norwich and World Service listeners.Some of the questions discussed include: gold has been the top choice both for jewellery makers and for buyers in many cultures all over the world. But there are similar metals which are more scarce - and more expensive - than gold, so it's not exclusivity that makes it popular. And why do men wear flamboyant jewellery at some Indian weddings? (Photo: Gold Indian wedding bracelet. Credit: Neha S/Getty Images)

Do you find it difficult to get a good night's sleep? If you do, you are not alone. According to the US National Institutes of Health, between 6 and 30 per cent of adults suffer from insomnia or lack of restorative sleep. Since the establishment of sleep medicine a century ago, we have learnt a lot about the causes of sleeplessness. And yet, as the continuing development of new sleep aids demonstrates, its prevalence remains high. Persistent lack of sleep can have serious consequences for your health but despite this some writers, and other creative people, seem to welcome it. Franz Kafka famously claimed that if he couldn't pursue his stories through the night, they would "break away and disappear". Iszi Lawrence discusses our changing understanding of insomnia, and its hold over our imagination, with Dr. Manvir Bhatia, the vice-president of Indian Society for Sleep Research; science journalist Kenneth Miller, author of Mapping the Darkness; the Scottish writer – and self-confessed ‘intermittent insomniac' - A L Kennedy; and World Service listeners.(Photo: A woman lying awake on a bed at night. Credit: Pony Wang/Getty Images.)

The first public run of the Japanese ‘bullet train', the Shinkansen, on the 1st of October 1964, captured public imagination worldwide. And it wasn't just the train's sleek look or its high speed that made the headlines. Behind the train's futuristic exterior lay a whole host of engineering innovations: new pantographs, automatic signalling, revolutionary drive units. Since then, very fast train travel has become available in over a dozen other countries. Places such as China and Spain have overtaken Japan when it comes to top train speed or the extent of the high-speed network. But the recent rise in remote working has reduced the demand for business rail travel and commuting. So what does the future hold for high-speed rail?Iszi Lawrence talks about the origins of high-speed rail and its current state to historian of modern Japan, Prof. Jessamyn Abel from Penn State university, civil engineering professor Amparo Moyano from the University of Castilla-La Mancha, Consultant Editor of the Railway Gazette Murray Hughes, poet Jan Ducheyne and World Service listeners.(Photo: A Shinkansen train arrives at a Tokyo station. Credit: Carl Court/Getty Images)

The centuries-old practice of keeping a personal journal.

Humans have always co-existed with mountains, as ancient remains found in glaciers prove. But our interest in them may have been more spiritual or religiously motivated, rather than as a place to go to improve our health and wellbeing. In some cultures today, mountains are still considered to be the home of deities. So when did mountaineering become a popular pastime and how did the obsession with bagging summits start? Iszi Lawrence investigates our evolving relationship with the planet's highest peaks.Iszi is joined by Dawn Hollis, author of Mountains before Mountaineering: The Call of the Peaks before the Modern Age; Peter Hansen, Professor of History and Director of International and Global Studies at Worcester Polytechnic Institute in the US, and author of various books on mountaineering including The Summits of Modern Man: Mountaineering after the Enlightenment; and anthropologist and mountaineer Young Hoon Oh. The programme will also hear from blogger Andrew Szalay, otherwise known as the Suburban Mountaineer. And a range of Forum listeners from around the world contribute their personal experiences of mountains.Produced by Fiona Clampin for BBC World Service(Photo: Mountaineer with ice pick ascending Hintertux Glacier in Austria. Credit: David Trood/Getty Images)

Many of us remember the first portable music device we owned: a transistor radio, a boombox, a Walkman or perhaps an iPod. We might even recall the songs we played on it. But we might be less aware of how profoundly audio technology developments from the 1950s to 2000s changed the ways in which we consume music and other audio outside of the home or concert venue. Transistor radios allowed outdoor sounds and noises to mix and compete with those coming over the airwaves, creating new auditory experiences; the cassette player gave the listener a cheap way of making and re-making their own playlists; and the advent of digital music players encouraged us to ‘own' music recordings without possessing a physical copy of the audio. Iszi Lawrence discusses the history of portable music with Dr. Annie Jamieson, Curator of Sound Technologies at Bradford's National Science and Media Museum; American drummer and writer Damon Krukowski; Dr. Jahnavi Phalkey, science historian and Founding Director of Science Gallery Bengaluru, India; Karin Bijsterveld, Professor of Science, Technology and Modern Culture at Maastricht University; and World Service listeners.(Photo: Andrii Iemelyanenko/ Getty Images)

Among all the talk about ‘knowledge economy' it is easy to forget that universal schooling is a relatively new phenomenon. Mandated first in a few European countries in the 18th century, it did not reach many others until the 20th. And the idea that women have an equal right to be educated frequently encountered stiff opposition, often from the privileged who feared that knowledgeable females would upset the social status quo.Just about everywhere, the right to women's education was hard won: for instance Bal Gangadhar Tilak, one of the influential leaders of Indian independence movement, campaigned vociferously for decades against sending girls to school, complaining that it would lead to increased competition for jobs and to women neglecting their ‘domestic duties'. Mary Carpenter, the acclaimed Victorian education reformer, maintained that neatness and needlework, rather than a full academic curriculum, were ‘essential to a woman'.Fast forward to 2024 and even though the gap between male and female educational attainment has narrowed world-wide, there are still many places where women lag behind, even in something as basic as literacy. According to UNESCO, women today account for almost two-thirds of all adults unable to read. So how did we get here? And how can we close this gap? Iszi Lawrence follows the story of women's education with Jane Martin, Professor of Social History of Education at Birmingham University; Parimala V. Rao, Professor of the History of Education at Jawaharlal Nehru University in New Delhi; Dr. Karen Teoh, Associate of the Fairbank Center for Chinese Studies at Harvard and World Service listeners.(Photo: Teenage girls and boys learning in classroom. Credit: Maskot/Getty Images)

In February 2024, the renowned Indian geneticist Dr. MS Swaminathan was posthumously awarded the country's highest civilian honour, the Bharat Ratna. This was in recognition of the dramatic increase in the yields of food staples, such as rice and wheat, that Indian agriculture experienced under his stewardship of the ‘green revolution' in the 20th century. That revolution is credited with saving many people from hunger and malnutrition across Asia and Latin America. And yet, half-a-century on farmers' incomes in Africa, Asia and Europe are falling and in many countries farmers are on the streets protesting. At the same time, the environmental impacts of intensive food production are becoming increasingly clear. So do we need a new ‘green revolution'? And is the use of the latest agricultural technology, from robots to AI the answer?Rajan Datar discusses the past and present of food growing with Professor of Economics Douglas Gollin, crop scientist Professor Nigel Halford, historian of science Dr. Madhumita Saha, robotics project manager Andreas Hofland and listeners from around the world.(Photo: Green ear of wheat. Credit: binabina/iStock/Getty Images Plus)

‘Always pass the salt and pepper together, even if your fellow diner has asked just for one of them'. That's the standard advice given by countless dining etiquette manuals, one of the many rules regarding proper manners that have been handed down from generation to generation. But what if some of the rules have become outdated, silly or just wrong? And why do we have etiquette in the first place? Where do the rules of polite conduct come from and are they the same the world over? Iszi Lawrence follows the story of etiquette across time and over several continents with the help of Annick Paternoster, Lecturer at the University of Lugano in Switzerland who has a special interest in the history of politeness; Professor Daniel Kadar from Dalian University of Foreign Languages in China, the HUN-REN Hungarian Research Centre for Linguistics, and the University of Maribor in Slovenia; Courtney Traub, author and editor of the travel website Paris Unlocked; Japanese writer and cultural commentator Manami Okazaki; former Chief of Protocol at the Foreign Ministry of Grenada Alice Thomas-Roberts; and Forum listeners from around the world.(Photo: Business people shake hands. Credit: iStock/Getty Images Plus)

Supermarkets: they are ubiquitous yet hard to define, lauded and vilified in roughly equal measures, and in many countries they have a huge influence on what we eat. Technological innovations, big social changes and new shopping habits have all shaped their development and today's megastores are a far cry from their small-scale ancestors of the 1930s. And yet, some quirks of supermarket design remain constant: for instance, why are the eggs always so hard to locate in the stores?Iszi Lawrence navigates supermarket aisles with the help of historian and economist Marc Levinson; Aarti Krishnan, Lecturer in Sustainability at Manchester University; Simona Botti, professor of marketing at London Business School and Forum listeners from around the world.(Photo: A customer in a supermarket. Credit: Adene Sanchez/ Getty Images)

In the 1990s, an advert for a brand of chocolate depicted a sophisticated gathering hosted by the foreign ambassador of an unspecified country. It hinted at a gilded existence of cocktail parties and small talk among influential, wealthy guests. Iszi Lawrence finds out how the stereotype of the diplomatic world compares with the reality of international relations. Who does the real work behind the scenes and who has the power? When we see powerful leaders on the world stage shaking hands and signing treaties, what has led up to that moment?Iszi discusses first hand experiences of the diplomatic world with the American diplomat Maryum Saifee and the former High Commissioner of Maldives to the UK, Farah Faizal. They are joined by Dr. Lorena de Vita, a historian of diplomatic relations to explain how their work impacts all of us. Plus World Service listeners from across the globe share their thoughts on what diplomats actually do. Produced by Fiona Clampin for the BBC World Service.

The humble plastic bag is actually a marvel of engineering: it is cheap, light, strong, waterproof and it has conquered the world. In countries where plastic bags have been banned, they are still being smuggled in. The environmental pollution and other problems that discarded plastic can cause has made it a focus of passionate debate. But is plastic really the problem or is it our increasing use of disposable and single-use items? The popularity of disposable products predates the invention of the plastic bag in the 1960s or even the advent of Western consumer society in the aftermath of the Second World War. And in the last three decades, so many new single-use items have been produced that we increasingly cannot imagine our lives without them, and not just in the festive season. So what is the way forward?Iszi Lawrence talks about all manner of disposable and single-use objects with Jennifer Argo, Professor of Marketing at the School of Business, Alberta University; Mark Miodownik, Professor of Materials & Society at University College London; Katherine Grier, Professor Emerita of History at the University of Delaware and founder of the online Museum of Disposability; space archaeologist Dr. Alice Gorman from Flinders University in Australia and listeners from around the world.(Photo: Digital image of plastic waste and a city skyline. Credit: Andriy Onufriyenko/Getty Images)

Political parties come in all shapes and sizes and their ideas are just as varied. But what kind of parties best reflect 21st-century society? How do we, as voters, choose between them at elections? What are their ever-increasing expenses spent on? And - perhaps most importantly - how well do political parties respond to the needs and views of the public? Iszi Lawrence discusses these questions with Professor Leonie Huddy from Stony Brook University who studies the psychology of politics, Associate Professor Karina Kosiara-Pedersen who researches party membership at the University of Copenhagen, Professor Paula Muñoz Chirinos who works on political finance at the University of the Pacific in Peru, Catherine Mayer co-founder of the Women's Equality Party in the UK, as well as student Luke Louis Ow from Singapore and other listeners from around the globe. (Photo: A sign in Dublin, Ireland in 2021. Credit: Artur Widak/Nur Photo/Getty Images)

We can probably all think of examples of bad bosses – the people who we love to gossip about with our colleagues outside work. And even if you're lucky enough to have had good experiences of management, you may be familiar with bad bosses from popular culture. But what makes a good manager and how can you inspire people in the workplace? It's a question that's been debated since the Industrial Revolution when rapidly expanding companies needed a way of controlling their workers. From there developed various theories of management, some of which drew on aspects of sociology and psychology. Rajan Datar is joined by Ann Francke, the chief executive of the Chartered Management Institute in the UK; Monica Musonda, the CEO of Java Foods in Zambia; and Todd Bridgman, Professor of Management Studies and Head of the School of Management at Victoria University of Wellington / Te Herenga Waka in New Zealand. We'll also present a selection of comments and experiences sent in by Forum listeners. Produced by Fiona Clampin (Photo credit: Getty/Luis Alvarez)

Whether we are pedestrians, cyclists or drivers, roads play a crucial role in our everyday lives. But where and how should we build any new ones? What kind of roads do we need? And how did we end up with the ones we have? Rajan Datar talks about the past and present of roads and roadbuilding with anthropologist Traci Ardren from the University of Miami, civil engineer Kate Castle, historians Alexis DeGreiff from the National University of Colombia in Bogota and Aparajita Mukhopadhyay from Kent University, literary scholar Stephanie Ponsavady from Wesleyan University in Connecticut and journalist Karim Waheed from Dhaka. Plus World Service listeners from around the globe share their road-trip joys and frustrations. (Photo: Road construction, worker with a shovel. Credit: blyjak/Getty Images)

For every young American under the age of 18, there are about two cats or dogs receiving free food and lodgings in US homes and that pattern is replicated in many other countries. So why do so many of us keep pets? Why do we name them, consider them part of the family? Companionship, pleasure, status symbol and kinship with all life have been offered as explanations but it's easy to forget that mass keeping of pets - as opposed to working animals - is a recent development of the last two centuries or so. Iszi Lawrence talks about our evolving relationship with pets with Dr. Anindita Bhadra from the Dog Lab at the Indian Institutes of Science Education and Research in Kolkata; Dr. Erin Hecht, evolutionary biologist from Harvard; Dr. Margo DeMello, anthrozoologist from Carroll College in Montana; writer and cultural commentator from Japan Manami Okazaki; Durham University historian Professor Julie-Marie Strange; and Rachel Williams, neuroscientist at UCL and comedian. We also sift through the dozens of comments and pet stories sent in by Forum listeners. (Photo: A young woman with her pet dog. Credit: Luis Alvarez/Getty Images)

In some ways the 21st century is a very unusual time when it comes to adolescence - a study in the US found that teenagers smoke less, drink less and have less sex than the previous generation. And worldwide young people are coming of age in a digital era, with the dangers and opportunities that represents. Our expectations of teenagers vary hugely depending on the social, historical and cultural context. Paleoanthropologist Ella Al-Shamahi takes us through the big evolutionary questions about adolescence: Why do humans go through this developmental stage? What's the point of all that teenage angst? And how come every generation stubbornly repeats the same mistakes? She is joined by a panel of experts: Laurence Steinberg is one of the world's leading experts on adolescence. He is Professor of Psychology and Neuroscience at Temple University in Philadelphia, USA. His latest book is called, 'You and Your Adult Child'. Emily Emmott is a lecturer in biological anthropology at University College London. She's currently researching the implications of the social environment around us during our teenage years. Jon Savage is a British writer and music journalist, best known for his history of the Sex Pistols and punk music. He's the author of 'Teenage: The Creation of Youth Culture'. Brenna Hassett is a bioarchaeologist at University College London and the author of 'Growing Up Human: The Evolution of Childhood'. Presented by Ella Al-Shamahi Produced by Jo Impey Image: Teenagers dance the twist around a radio cassette recorder in a street in the Harajuku district of Shibuya, Tokyo, Japan, 1978 (Photo by Keystone/Hulton Archive/Getty Images)

From Bhutan to The Bahamas and Iceland to Indonesia, mass tourism has grown at an unprecedented rate over the last few decades. Today's top destinations are struggling with the sheer numbers of visitors and the United Nations has called for a total rethink on how the industry operates. The origins of travel for pleasure go back centuries and package holidays in the 1960s made it accessible to many in the West but it's only the combination of cheap flights and the advent of the internet that has led to truly global tourism on a mass scale. Whilst the industry now generates huge income for many companies and individuals around the globe, critics point to the cost to both the environment and humankind. Drawing on listeners' questions and comments, Rajan Datar examines the way mass tourism has impacted people's lives, both positively and negatively, and asks if the enforced pause in tourism caused by Covid was utilised as an opportunity for a re-think. He is joined by Sihle Khumalo, a popular South African travel writer; Shazia Mirza, a renowned British comedienne and writer; Qupanuk Olsen, originally a mining engineer but now Greenland's leading travel influencer; Prof. Noel Salazar, anthropologist of tourism from KU Leuven in Belgium; Iñigo Sánchez-Fuarros, senior researcher at the Institute of Heritage Sciences of the Spanish National Research Council and Dr. Birgit Trauer, tourism consultant and educator from Australia. [Photo: El Postiguet Beach in Alicante, Spain in the summer of 2022. Credit: Marcos del Mazo/LightRocket via Getty Images.]

Are we in a new age of information warfare? The technology to create deepfakes has progressed steadily over the past decade and enables anyone to create videos of people saying and doing things they didn't actually say or do. But the idea of manipulating video to spread misinformation is almost as old as film itself. Presenter Iszi Lawrence invites a panel of experts to tackle your questions about AI technology and the uses of deepfakes. Is this something we should be concerned or excited about? What can be done to detect and block malicious content? And what does this mean for our understanding of truth and reality? Iszi is joined by Francesca Panetta, Director of the AKO Storytelling Institute at the University of the Arts, London; Joshua Glick, Visiting Associate Professor of Film and Electronic Arts at Bard College, NY and Samantha Cole, senior Editor at Motherboard/Vice and author of 'How Sex Changed the Internet'. We also hear from artist and technologist Halsey Burgund and from listeners Brandy and Ahmad. Image: A digitised face Image Credit: Getty Images

When telecoms engineer Martin Cooper first chatted in public on a mobile phone 50 years ago few would have predicted that this brief telephone call would be the start of a revolution that would change the lives of billions. Over the last half a century, the mobile has transformed not just how we communicate with each other but also how we view and interact with the world around us. However, recent research suggests that this may not all be for the best. Drawing on listeners comments and questions, Rajan Datar explores what sets the mobile phone apart from previous communication devices. Why did SMS messaging take off so quickly after a slow start in the 1990s? And how did the morphing of a portable phone into a pocket computer a decade later lead to a situation where many people now interact with their phone more than with any human? Rajan is joined by Scott Campbell, Professor of Telecommunications at the University of Michigan whose work focuses on meanings, uses and consequences of mobile communication in everyday life; behavioural psychologist Dr. Daria Kuss from Nottingham Trent University who specialises in cyberpsychology, technology use and addictive behaviours; and comedienne and PhD. candidate at Exeter University Helen Keen who is researching social connections at the Wellcome Centre for Cultures and Environments of Health. We also hear from educator Wong Fung Sing from Singapore and other listeners from around the world. (Photo: mobile phones in a stack on a table. Credit: iStock/Getty images)

The Hoover Dam in the US, the Aswan Dam in Egypt and the recently opened, and sumptuously named, Grand Ethiopian Renaissance dam. Since modern times, huge mega dams like these to tame rivers, create water storage and hydropower, have become a symbol of nationhood used to create national pride and bolster political power, from the Cold War to today. Nehru, the first Prime Minister of India, called dams the temples of modern India. But dams have also been highly controversial, displacing rural populations, disrupting local ecology and more recently it's been shown that dams can increase the amount of greenhouse gases in the earth's atmosphere. So why are so many countries like China still highly involved in dam building, and will they need to change tack in the future? And, could the humble beaver offer a solution? To discuss the past, present, and future of dam building, Rajan Datar is joined by Nikita Sud, Professor of the Politics of Development at Oxford University; Donald C. Jackson the Cornelia F. Hugel Professor of History at La Fayette University in the US and author of many books on the history of dam building, including Building the Ultimate Dam: John S. Eastwood and the Control of Water in the West; and Dr Majed Akhter, a political geographer who is senior lecturer in Geography at King's College London. With the contribution of Dr Emily Fairfax, an ecohydrologist with an expertise in beaver activity and beaver dams from California State university Channel Islands in the US. Produced by Anne Khazam for the BBC World Service. (Photo: The Hoover Dam on the Colorado River straddling Nevada and Arizona at dawn. Credit: Sean Pavone via Getty Images)

From Persia to India to Greece – they called him The Great – that is Alexander the Great. Also known as Alexander III of Macedon, he was one of the most successful military leaders of all time. Undefeated by the time of his death in 323 BCE, he is still a go-to figure when people want to define an empire builder. But how should we view this often cruel and destructive militarist today in the light of current world events? And, despite his brutality, like his ransacking of the beautiful capital city of Persepolis, is there a more progressive side to Alexander, his desire for cultural assimilation for instance, that explains why he became an inspiration not just to nationalists and imperialists but also to writers, poets, and the gay community? To discuss the relevance of Alexander the Great today, Rana Mitter is joined by James Romm, Professor of Classics at Bard College in New York state whose latest book is Demetrius: Sacker of Cities, the failed but would-be successor to Alexander the Great; Dr Haila Manteghi from the University of Münster in Germany who's the author of Alexander the Great in the Persian tradition; Ali Ansari, Professor of Iranian History at the University of St Andrews in the UK; and Meg Finlayson, a specialist on the evolution of the queer Alexander, from the University of Durham in the UK. Produced by Anne Khazam for the BBC World Service. (Photo: The Alexander mosaic, a Roman floor mosaic from Pompei that dates from circa 100 BCE. Credit: Simone Crespiatico via Getty images)

From coronations to cup finals, many of us love a big event, a ceremony with age-old observances. Indeed rituals, whether public spectaculars or more personal ones, such as a particular daily routine, have been part of human experience since time began. But why do rituals persist even though so many of them seem to serve no obvious practical purpose? Rajan Datar looks for clues in our past with the help of Egyptologist Dr. Elizabeth Frood and historian of Venice Prof. Edward Muir. It turns out that non-human animals – for instance elephants - also display ritual-like behaviour and not always for practical reasons. We hear from a leading behavioural ecologist, Dr. Caitlin O'Connell-Rodwell. We examine whether rituals really do remain unchanging through time: it might seem to be their essential characteristic but in reality they continuously evolve. And what about the power of contemporary collective ceremonies and the strong emotions that swell inside us from being part of a huge crowd? Anthropologist Dr. Dimitris Xygalatas gives us his insights. (Photo: Shinto priests conduct the Oharae ritual in Tokyo. Credit: Tomohiro Ohsumi/Getty Images)

Drawing on traditional music, pop culture, kitsch, rock and modernist poetry to mention just a few of their sources of inspiration, the short-lived Tropicália movement in late 1960s Brazil was provocative and anti-authoritarian. Perhaps most importantly it represented a uniquely Brazilian aesthetic that could only have emerged from that country's specific culture and history. The movement's leading lights were eventually arrested by the military regime that governed Brazil at the time, and exiled to London. But Tropicália paved the way for other performers to demand artistic freedom. With the help of musical examples, Rajan Datar and guests will explore what made Tropicália so disruptive. Joining Rajan will be singer Mônica Vasçoncelos and guitarist Gui Tavares, social scientist Professor Liv Sovik from the Federal University of Rio de Janeiro, who's published widely on Tropicália, including a collection of essays entitled Tropicália Rex: Popular music and Brazilian culture; and David Treece, Emeritus professor of Portuguese at King's College, London, who's written extensively on Brazilian popular music, including the book Brazilian Jive: From Samba to Bossa and Rap. Produced by Fiona Clampin for the BBC World Service (Image: Gilberto Gil in The Unique Concert at The Reunion in France. Credit: IMAZ PRESS/Gamma-Rapho via Getty Images)

Nearly everything we consume is transported by ship. The biggest container ships in the world are among the largest moving structures made by man and can carry over 24,000 20-foot container units. The standardisation of these simple metal containers in the 1950s and 60s marked a turning point in world trade, driving down costs and ultimately fuelling globalisation. Now that supply chains have become ever more complex and been put under increasing strain, we take a look at the history of the shipping container. Joining Rajan Datar are Marc Levinson, American historian and economist and author of The Box: How the Shipping Container Made the World Smaller and the World Economy Bigger; Alan McKinnon, professor of Logistics at Kühne Logistics University in Hamburg and author of Decarbonising Logistics: Distributing Goods in a Low Carbon World; Yash Gupta, shipping industry expert with over 20 years' experience in vessel management and logistics. Presenter: Rajan Datar Producer: Jo Impey for BBC World Service (Photo: Aerial view of a container ship passing under a suspension bridge with truck crossing above. Credit: Shaul/Getty Images)

Developments in new technology such as DNA sequencing have transformed our understanding of the Neanderthals, one of a group of archaic humans who occupied Europe, the Middle East and Western Asia more than 300,000 years ago. First identified by fossil remains in 1856 in a German quarry, the Neanderthals led an extremely physical existence as hunter-gatherers. They were stronger than us, adaptable as a species to huge variations in climate, with brains as large as ours and sophisticated ways of creating tools. Many of us carry some of the DNA of Neanderthals, thanks to interbreeding with homo sapiens. Although the Neanderthals today are no longer with us, their story has a lot to tell us about ourselves and our future survival on the planet. Rajan Datar is joined by Janet Kelso, a computational biologist and Group Leader of the Minerva Research Group for Bioinformatics at the Max Planck Institute for Evolutionary Anthropology. She specialises in the analysis of DNA sequencing of ancient people such as Neanderthals; Katerina Harvati, the Senckenberg Professor for Paleoanthropology and Director of the Institute for Archaeological Sciences at the University of Tübingen. Her work focuses on the origins of modern humans and Neanderthal evolution; and archaeologist and writer Rebecca Wragg Sykes, Honorary Fellow in the School of Archaeology, Classics and Egyptology at the University of Liverpool. Her award-winning book Kindred: Neanderthal Life, Love, Death and Art was published in 2020. Produced by Fiona Clampin for the BBC World Service (Image: Neanderthal Female, re-created by artists Andrie and Alfons Kennis. Photo: Joe McNally/Getty Images)

A Russian army stands at the gates of the capital of another country, a country that Russia has previously occupied and one that, according to Russian politicians, has no right to independent existence. Sounds familiar? That capital city was Warsaw and the year was 1920. But what happened in Poland just after the end of the First World War bears strong similarities to what went on near Kyiv in 2022. After World War I, Russian Bolsheviks, and Lenin in particular, wanted to re-occupy Poland, and indeed Ukraine, Belarus and some other countries, so that they could serve as a bridge for exporting communist revolution to Western Europe. The Poles resisted even though at first they were outnumbered and outgunned by the Russians. The result was the Polish-Bolshevik war which wasn't fully resolved until 1921 and which had a big impact on the future shape of inter-war Europe. To guide us through the Polish-Bolshevik war, Rajan Datar is joined by three distinguished historians: Dr. Pawel Duber, a Researcher at Nottingham Trent University whose work focuses on Poland in the first half of the 20th century; Anita Prazmowska, Professor of International History at London School of Economics and the author of many publications on Polish history in the last century and beyond; and Robert Service, Emeritus Professor of Russian history at Oxford University whose books cover Russia from the Mongol conquest to Putin. (Photo: Red Army on the Polish front, c.1920. Credit: Photo 12/Getty Images)

The pandemic has made us all rethink how we work. Where once millions of people used to travel into work in tall glass buildings in big cities every day, now our idea of the office has come to include the kitchen table or maybe even a coffee shop. Yet despite the temptation to shift permanently to remote working, many organisations say the events of the past few years have actually underlined the importance of offices as spaces that connect people. So what are offices for? We are delving back into the history of the modern office to learn how past designs could help us in the future. Presenter Rajan Datar is joined by three guest experts: Nigel Oseland is an environmental psychologist and consultant at Workplace Unlimited in the UK. He's the author of Beyond the Workplace Zoo: Humanising the Office. Jennifer Kaufmann-Buhler is Associate Professor of Design History at Purdue University in West Lafayette, Indiana. She's the author of Open Plan: A Design History of the American Office. And Agustin Chevez is a workplace researcher and architect, and Adjunct Research Fellow at the Centre for Design Innovation at Swinburne University in Melbourne, Australia. He's the author of The Pilgrim's Guide to the Workplace. Producer: Jo Impey (Photo: Modern coworking interior with an open-plan office lounge and plants; Credit: ExperienceInteriors/Getty Images)

In the summer of 1946 inflation in Hungary reached 41.9 quadrillion per cent. That's 41.9 followed by 14 zeros – the highest rate of inflation ever recorded anywhere in the world. It meant prices of everyday goods and services doubled, on average, every 15 hours. As the shattered country struggled to get to its feet after World War Two, weighed down by a Soviet occupation and punishing reparations, its government had little choice but to print more and more money, further fuelling the price spiral. The hyperinflation stripped wages of almost all their value and plunged millions of Hungarians into a new fight for survival, but as they lost all faith in banknotes they turned to ever more inventive ways to trade and earn a living. We discuss how life for ordinary Hungarians changed amidst the chaos, what caused and eventually halted the economic disaster, and what the whole episode can tell us about the meaning of money. Bridget Kendall is joined by Béla Tomka, professor of modern social and economic history at the University of Szeged, in Hungary; László Borhi, the Peter A Kadas Chair and associate professor in the Department of Central Eurasian Studies in the Hamilton-Lugar School at Indiana University, USA; and Pierre Siklos, professor of economics at Wilfred Laurier University in Waterloo, Canada. Producer: Simon Tulett (Picture: Hungarian pengo banknotes lying on the ground in Budapest. Credit: Louis Foucherand/AFP via Getty Images)

Rachel Carson's 1962 book Silent Spring has probably done more than any other to raise concerns about the damage that uncontrolled use of chemicals can cause to the natural world. Carson imagined a ‘silent spring' in a world where birds no longer sang, killed off by indiscriminate spraying of pesticides. Her plea for caution when using insecticides led to major changes in government regulation of agrochemicals both in the United States and elsewhere. So who was Rachel Carson? How did this scientist with a passionate interest in marine biology turn first into a best-selling author and then into an environmental campaigner? And - six decades on - have the warnings of Silent Spring been heeded? Bridget Kendall is joined by Dr. Sabine Clarke, Senior Lecturer in Modern History at University of York with a particular interest in the history of synthetic insecticides; Michelle Ferrari, an award-winning film maker who directed a documentary about Rachel Carson's life for the American public broadcaster PBS; and Professor David Kinkela, an environmental historian and chair of the Department of History at Fredonia, State University of New York whose books include 'DDT and the American Century'. The reader is Ina Marie Smith. (Photo: Airplane dusting a field with DDT. Credit: Bettmann/Getty Images)

Why do we divide our lives into 7-day chunks? Unlike the day, month or year, there's no natural reason for this cycle, but nevertheless the week is now deeply ingrained in us and has proven very resistant to change. We explore the pagan, religious and early scientific roots of this man-made rhythm, the ideological battles fought over it, and the reason why the number seven came out on top. Our expert guests explain where the names of our days come from, why the weekend was born, and how the week has come to dominate our economic and social lives. There have, however, been several radical attempts to rip up the 7-day week – we hear about these alternatives and why they ultimately failed. Rajan Datar is joined by Eviatar Zerubavel, distinguished professor of sociology emeritus at Rutgers University, New Jersey, and author of ‘The Seven-Day Circle: The History and Meaning of the Week'; Ilaria Bultrighini, honorary research fellow in ancient history at University College London; and David Henkin, professor of history at the University of California, Berkeley, and author of ‘The Week: A History of the Unnatural Rhythms That Made Us Who We Are'. Producer: Simon Tulett (Picture: A signpost with the seven days of the week on the directional arrows against a bright blue cloudy sky. Credit: Getty Images)

Forugh Farrokhzad burst into the public consciousness with a series of poems that sent shockwaves through Persian society in the mid-1950s. Her early poetry focused on the female experience and female desire, overturning – in the words of one biographer – 1,000 years of Persian literature. Her critics sought to dismiss her skills as a writer by seeing her poetry purely as a confessional outburst of a divorced woman. That attitude has tended to overshadow her achievements, although her private life is so compelling it's perhaps inevitable. Since her early death in a car accident, Forugh's life and poetry have been inspirational for many Iranians, who see in her an artist who was prepared to defy authority and convention to speak out. Bridget Kendall is joined by Sholeh Wolpé, a writer-in-residence at the University of California, Irvine. She's a poet, playwright, librettist and translator of Forugh's work; author Jasmin Darznik, associate professor and chair of the creative writing progamme at California College of the Arts. Her novel, Song of a Captive Bird, is a re-imagining of Forugh's life inspired by her poetry, interviews and correspondence; and Levi Thompson, Assistant Professor of Persian and Arabic Literature in the Department of Middle Eastern Studies at the University of Texas at Austin. He's the author of Reorienting Modernism in Arabic and Persian Poetry. Produced by Fiona Clampin for the BBC World Service (Photo: Forugh Farrokhzad. Credit: Courtesy of Farrokhzadpoem.com)

Today's counter-culture and alternative movements question mainstream norms, such as putting too much value on material possessions. The Cynics, practical philosophers of ancient Greece and Rome, also rejected conventional desires to seek wealth, power and fame. They were not your usual kind of philosophers: rather than lecturing or writing about their ideas, they acted out their beliefs by denying themselves worldly possessions and tried to live as simply as possible. Their leader, Diogenes of Sinope, allegedly slept in a ceramic jar on the streets of Athens and ate raw meat like a dog, flouting convention to draw attention to his ideas. So who were the Cynics? How influential was their movement? What made it last some 900 years? And why does the term 'cynicism' have a different meaning today? Bridget Kendall is joined by three eminent scholars of Greek philosophy: Dr. William Desmond, Senior Lecturer in Ancient Classics at Maynooth University in Ireland and author of several books on the Cynics; Dr. Elena Cagnoli Fiecconi, Lecturer in Ancient Philosophy at University College London; and Mark Usher, Professor of Classical Languages and Literature at the University of Vermont and author of new Cynic translations into English. (Image: The meeting of Alexander and Diogenes, detail from a tapestry, Scotland. Credit: DEA/S. Vannini/Getty Images)

Calories are fundamental to the way many of us view food and our own bodies - you'll find them on supermarket shelves, restaurant menus, and in cookbooks. But they didn't start out that way. Originally coined during the study of steam engines and industrial energy, the term ‘calorie' was transformed into a measurement of food as ‘fuel' for humans, influencing industrial, public health and even foreign policies for more than 100 years. It's also spawned a multi-billion dollar diet industry – we learn about the author whose battle with her weight introduced the world to calorie counting. But should we be paying the calorie so much attention? There are growing concerns that it's a misleading, perhaps even dangerous guide to how our bodies digest food and burn energy. Bridgett Kendall is joined by Dr Giles Yeo, professor of molecular neuroendocrinology at the University of Cambridge and author of ‘Why Calories Don't Count: How we got the science of weight loss wrong'; Adrienne Rose Bitar, a specialist in the history and culture of American food and health at Cornell University, New York, and author of ‘Diet and the Disease of Civilization'; and Nick Cullather, professor of history and international studies at Indiana University, Bloomington. (Picture: A smartphone showing a calorie counting app and surrounded by fresh vegetables, donuts and other snacks on a table. Credit: Getty Images)

Belarusian lands have seen dramatic upheavals throughout the twentieth century and today, like its neighbour Ukraine to the south, Belarus finds itself on the cusp, in between the countries of the European Union on one side and Putin's Russia on the other. While Belarus often features in the news, its history is less well known. So how far back does the story of Belarus go? How was its sense of national identity forged? And how did it survive the traumas and repressions that it has been subjected to by various invaders and imperial powers? Three historians of Eastern Europe join Bridget Kendall to answer these questions: Dr. Nelly Bekus, Lecturer at the University of Exeter who studies post-Soviet nations; Dr. Natalya Chernyshova, Senior Lecturer in modern history at Winchester University who researches the 20th century in Belarus and beyond; and Dr. Andrej Kotljarchuk, Senior Lecturer at Uppsala University in Sweden who focuses on the Second World War in Eastern Europe. (Photo: Mir Castle in Belarus, a UNESCO World Heritage Site. Credit: tbralnina/Getty Images)

Activist Margaret Sanger is responsible for one of the most significant medical and social changes of the 20th century – giving women the means to control the size of their families. The former nurse, who'd witnessed the aftermath of backstreet abortions and her own mother's premature death after 18 pregnancies, founded the birth control movement in the United States and helped to spread it internationally. She was also instrumental in developing the pill, now one of the world's most popular contraceptives. Her campaign was enormously controversial – she faced fierce opposition from the Catholic Church and was arrested several times for breaking strict anti-contraception laws. And her legacy is contested today – her association with the then powerful eugenics movement has thrown doubt on her motives and drawn allegations of racism by some. Even Planned Parenthood, the organisation she helped create, has distanced itself from her. Bridget Kendall discusses her inspiration and battle against the powerful status quo with Ellen Chesler, a biographer of Margaret Sanger from New York; Elaine Tyler May, professor of American studies and history at the University of Minnesota and author of ‘America and the Pill: A History of Promise, Peril and Liberation'; Sanjam Ahluwalia, professor of history and women's and gender studies at Northern Arizona University and author of ‘Reproductive Restraints: Birth Control in India, 1877-1947'; and Dr Caroline Rusterholz, a historian of populations, medicine and sexuality at the University of Cambridge. Producer: Simon Tulett (Picture: Margaret Sanger circa 1915. Credit: Hulton Archive/Getty Images)