Melvyn Bragg and his guests discuss the Greek poet Sappho. Born in the late seventh century BC, Sappho spent much of her life on the island of Lesbos. In antiquity she was famed as one of the greatest lyric poets, but owing to a series of accidents the bulk of her work was lost to posterity. The fragments that do survive, however, give a tantalising glimpse of a unique voice of Greek literature. Her work has lived on in other languages, too, translated by such major poets as Ovid, Christina Rossetti and Baudelaire.WithEdith Hall Professor of Classics at King's College, LondonMargaret Reynolds Professor of English at Queen Mary, University of Londonand Dirk Obbink Professor of Papyrology and Greek Literature at the University of Oxford Fellow and tutor at Christ Church, OxfordProducer: Simon Tillotson.

Melvyn Bragg and his guests discuss the California Gold Rush. In 1849 the recent discovery of gold at Coloma, near Sacramento in California, led to a massive influx of prospectors seeking to make their fortunes. Within a couple of years the tiny settlement of San Francisco had become a major city, with tens of thousands of immigrants, the so-called Forty-Niners, arriving by boat and over land. The gold rush transformed the west coast of America and its economy, but also uprooted local populations of Native Americans and made irreversible changes to natural habitats.With:Kathleen Burk Professor of Modern and Contemporary History at University College LondonJacqueline Fear-Segal Reader in American History and Culture at the University of East AngliaFrank Cogliano Professor of American History at the University of Edinburgh.

Melvyn Bragg and his guests discuss the scientific achievements of the Curie family. In 1903 Marie and Pierre Curie shared a Nobel Prize in Physics with Henri Becquerel for their work on radioactivity, a term which Marie coined. Marie went on to win a Nobel in Chemistry eight years later; remarkably, her daughter Irène Joliot-Curie would later share a Nobel with her husband Frédéric Joliot-Curie for their discovery that it was possible to create radioactive materials in the laboratory. The work of the Curies added immensely to our knowledge of fundamental physics and paved the way for modern treatments for cancer and other illnesses.With:Patricia Fara Senior Tutor of Clare College, University of CambridgeRobert Fox Emeritus Professor of the History of Science at the University of OxfordSteven T Bramwell Professor of Physics and former Professor of Chemistry at University College LondonProducer: Simon Tillotson.

Melvyn Bragg and his guests discuss the life and work of Al-Ghazali, a major philosopher and theologian of the late 11th century. Born in Persia, he was one of the most prominent intellectuals of his age, working in such centres of learning as Baghdad, Damascus and Jerusalem. He is now seen as a key figure in the development of Islamic thought, not just refining the theology of Islam but also building on the existing philosophical tradition inherited from the ancient Greeks.With:Peter Adamson Professor of Late Ancient and Arabic Philosophy at the LMU in MunichCarole Hillenbrand Professor of Islamic History at Edinburgh and St Andrews UniversitiesRobert Gleave Professor of Arabic Studies at the University of ExeterProducer: Victoria Brignell.

Melvyn Bragg and his guests discuss dark matter, the mysterious and invisible substance which is believed to make up most of the Universe. In 1932 the Dutch astronomer Jan Oort noticed that the speed at which galaxies moved was at odds with the amount of material they appeared to contain. He hypothesized that much of this 'missing' matter was simply invisible to telescopes. Today astronomers and particle physicists are still fascinated by the search for dark matter and the question of what it is.With Carolin Crawford Public Astronomer at the Institute of Astronomy, University of Cambridge and Gresham Professor of AstronomyCarlos Frenk Ogden Professor of Fundamental Physics and Director of the Institute for Computational Cosmology at the University of DurhamAnne Green Reader in Physics at the University of NottinghamProducer: Simon Tillotson.

Melvyn Bragg and his guests discuss the epic poem Beowulf, one of the masterpieces of Anglo-Saxon literature. Composed in the early Middle Ages by an anonymous poet, the work tells the story of a Scandinavian hero whose feats include battles with the fearsome monster Grendel and a fire-breathing dragon. It survives in a single manuscript dating from around 1000 AD, and was almost completely unknown until its rediscovery in the nineteenth century. Since then it has been translated into modern English by writers including William Morris, JRR Tolkien and Seamus Heaney, and inspired poems, novels and films.With:Laura Ashe Associate Professor in English at the University of Oxford and Fellow of Worcester CollegeClare Lees Professor of Medieval English Literature and History of the Language at King's College LondonAndy Orchard Rawlinson and Bosworth Professor of Anglo-Saxon at the University of OxfordProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the history and significance of eunuchs, castrated men who were a common feature of many civilisations for at least three thousand years. Eunuchs were typically employed as servants in royal households in the ancient Middle East, China and classical antiquity. In some civilisations they were used as administrators or senior military commanders, sometimes achieving high office. The tradition lingered until surprisingly recently, with castrated singers remaining a feature of Vatican choirs until the nineteenth century, while the last Chinese eunuch of the imperial court died in 1996.With:Karen Radner Professor of Ancient Near Eastern History at University College LondonShaun Tougher Reader in Ancient History at Cardiff UniversityMichael Hoeckelmann British Academy Postdoctoral Fellow in the Department of History at King's College LondonProducer: Thomas Morris.

Melvyn Bragg and his guests discuss Adam Smith's celebrated economic treatise The Wealth of Nations. Smith was one of Scotland's greatest thinkers, a moral philosopher and pioneer of economic theory whose 1776 masterpiece has come to define classical economics. Based on his careful consideration of the transformation wrought on the British economy by the Industrial Revolution, and how it contrasted with marketplaces elsewhere in the world, the book outlined a theory of wealth and how it is accumulated that has arguably had more influence on economic theory than any other.With:Richard Whatmore Professor of Modern History and Director of the Institute of Intellectual History at the University of St AndrewsDonald Winch Emeritus Professor of Intellectual History at the University of SussexHelen Paul Lecturer in Economics and Economic History at the University of SouthamptonProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the photon, one of the most enigmatic objects in the Universe. Generations of scientists have struggled to understand the nature of light. In the late nineteenth century it seemed clear that light was an electromagnetic wave. But the work of physicists including Planck and Einstein shed doubt on this theory. Today scientists accept that light can behave both as a wave and a particle, the latter known as the photon. Understanding light in terms of photons has enabled the development of some of the most important technology of the last fifty years.With:Frank Close Professor Emeritus of Physics at the University of OxfordWendy Flavell Professor of Surface Physics at the University of ManchesterSusan Cartwright Senior Lecturer in Physics and Astronomy at the University of Sheffield.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Indian Emperor Ashoka. Active in the 3rd century BC, Ashoka conquered almost all of the landmass covered by modern-day India, creating the largest empire South Asia had ever known. After his campaign of conquest he converted to Buddhism, and spread the religion throughout his domain. His edicts were inscribed on the sides of an extraordinary collection of stone pillars spread far and wide across his empire, many of which survive today. Our knowledge of ancient India and its chronology, and how this aligns with the history of Europe, is largely dependent on this important set of inscriptions, which were deciphered only in the nineteenth century.With:Jessica Frazier Lecturer in Religious Studies at the University of Kent and a Research Fellow at the Oxford Centre for Hindu StudiesNaomi Appleton Chancellor's Fellow in Religious Studies at the University of EdinburghRichard Gombrich Founder and Academic Director of the Oxford Centre for Buddhist Studies and Emeritus Professor of Sanskrit at the University of OxfordProducer: Thomas Morris.