Anxiety is a universal human emotion that has been described as the price-tag on freedom. It is the price we pay for a brain that can anticipate the future. But when anxiety spirals out of control it can take over our lives as we battle against phobias, panic attacks, dread and debilitating fear. So how is anxiety triggered and constructed in the brain? Is the almond-shaped amygdala the seat of fear or are our anxieties constructed in other parts of the brain? And for those made miserable by anxiety, how best can it be treated? Bridget Kendall explores the biology of anxiety and some unexpected approaches to treatment, including friendship benches and therapy horses. She is joined by Joseph LeDoux, author of Anxiety and professor of Neuroscience and director of the Emotional Brain Institute, New York University; Dr Dixon Chibanda, a consultant Psychiatrist in Zimbabwe and pioneer of the Friendship Bench; Susanna Forrest, a British authority on the horse and author of The Age of Horse: An Equine Journey through Human History.(Photo: A young man holding his head in his hands)

Our lives are increasingly cluttered by images, not just in the world around us, but on advertising bill-boards, television screens, and even on our mobile phones. So how are we to process this barrage of information and make sense of the visual world?How can today’s designers help us and how are we to avoid image-overload? Bridget Kendall talks to three people who help us navigate the increasingly crowded world of visual imagery: Alan Kitching, one of the world’s foremost practitioners of letterpress typographic design and printmaking, Aowen Jin, a Chinese-born artist who leads museum tours in the dark and Roma Agrawal, a structural engineer who spent six years designing London’s skyscraper The Shard.(Image: Edition Print, 2012 by Alan Kitching)

A small toy balloon floating free into the sky. A giant hot air balloon filled with passengers peering down at the ground. Classic images, but what about the huge balloons now being developed to help us explore outer space? Or the tiny balloons which bio engineers inflate inside your body to help blood surge through your veins? Or the extraordinary balloonomania that spread across Northern Europe in the late 18th century? Bridget Kendall explores the colourful history of the balloon and its even more intriguing future with guests:Debbie Fairbrother, Chief of NASA’s Balloon Programme Office.Professor Claudio Capelli, cardiovascular engineer from the Great Ormond Street Hospital for Children in London.Fiona Stafford, Professor of literature from Somerville College, University of Oxford.Photo: NASA’s super pressure balloon is designed for long-duration flights at mid-latitudes to provide scientists and engineers with a means to inexpensively access the ’near-space’ environment for conducting research and technology test missions. The balloon’s operational float altitude is 110,000 feet (33.5 kilometers) (Credit: NASA/Bill Rodman)

Everyone likes to be alone sometimes, but we also all spend much of our lives collaborating and sharing things with others. Many argue that on this increasingly crowded planet, we need to master the art of sharing much better if we are to survive and flourish. So what makes us want to share new ideas and pass on our experience? Bridget Kendall discusses three very kinds of sharing - digital information, genes and national infrastructure. She is joined by Jonah Berger, marketing professor at the Wharton School at the University of Pennsylvania in the United States; Connie Jeffery, assistant professor of Biological Sciences and head of the Jeffery Lab at the University of Illinois in Chicago; Dr Elham Ibrahim, commissioner for Infrastructure and Energy for the African Union in Addis Ababa, Ethiopia.(Photo: The Golden Gate Bridge, in California, provides a means to sharing infrastructure. Credit: Getty Images)

New ideas about volcanoes, earthquakes and other geological processes that both enrich and threaten us. Jack Stewart is joined by four leading Earth scientists in the city of Yokohama at the 2016 Goldschmidt Conference - volcanologists Tamsin Mather and Michihiko Nakamura, plate tectonics expert Carl Spandler and seismologist and Nature magazine editor John VanDecar. (Photo: Mount Fuji in Japan. Credit: Getty Images)

If you think of your favourite foods – chocolate, maybe, or samosas, or pizza – do you really know where all the ingredients came from? Bridget Kendall asks the food scientist Chris Elliott, the software designer Jérôme Malavoy and the food labelling expert Monique Raats. Photo: The food label on a box of brownies (Getty Images)

One of the first things that comes to mind when thinking of radioactivity is often a nuclear accident or dangerous rays. But radioactivity is in fact a much more varied phenomenon, one that can bring us great benefits as well as put us in danger. With help from three experts, Rajan Datar looks for a more nuanced picture of the role radioactivity plays in our lives.Photo: A symbol for radioactivity is visible on a radioactively-contaminated container. (Getty Images)

Acts of defiance small or large have proved to be incredibly powerful throughout history, but when does defiance spill into aggression? Bridget Kendall asks the employment lawyer Lewis Maltby, the theatre director Olivier Py and the psychopathologist Dr Luna Muñoz Centifanti. (Photo: Historic Marker at the bus stop in Alabama, USA, where Rosa Parks refused to give up her seat. Credit: Getty Images)

The Obama administration recently announced it will spend over a hundred million dollars on deepening our knowledge of the human microbiome - the bacteria, fungi, viruses and other organisms which make their home in and on our bodies. Bridget Kendall is joined by three people whose work in different ways enriches our appreciation of the world of human microbiota - the epidemiologist Mark Woolhouse, microbiology educator Christine Marizzi and gut flora researcher Jeroen Raes.(Photo: The NYC Biome MAP part of the Collective Urban Biome MAP project. Credit: Genspace NYC and The DNA Learning Center)

We are at The Metropolitan Museum of Art in New York at The Met Breuer, where the exhibition "Unfinished: Thoughts Left Visible", is a springboard to explore the notion of things unfinished or incomplete. The concept of a work of art that is unfinished, the so called 'non finito' style, has been with us since the Renaissance. But it has taken on new meaning in modern art of the 20th and 21st Century. So how should we respond to a work which is unfinished whether it is a painting, a book, a piece of music, a film or a building? And, how does the idea of ‘unfinished’ translate into an ever-changing historical and political context?Presenter Bridget Kendall is joined by Andrea Bayer, Jayne Wrightsman, Curator in The Met’s Department of European Paintings and co-curator of "Unfinished: Thoughts Left Visible" at The Met Breuer; Negin Farsad, a celebrated stand-up comedian, actor and film-maker of Iranian heritage; Kerry James Marshall, the internationally renowned American artist whose work will be the subject of a major exhibition at The Met Breuer this October 2016; Andrew Solomon, professor of Clinical Psychology at Columbia University in New York, and an award-winning writer who is also president of PEN American Center.(Photo: The Met Breuer in New York. Credit: Ed Lederman)