In Our Time

Melvyn Bragg and his guests discuss the life and work of Benjamin Franklin. A printer, statesman, diplomat, writer and scientist, Franklin was one of the most remarkable individuals of the eighteenth century. His discoveries relating to the nature of electricity, and in particular a celebrated experiment which involved flying a kite in a thunderstorm, made him famous in Europe and America. His inventions include bifocal spectacles, and a new type of stove. In the second half of his life he became prominent as a politician and a successful diplomat. As the only Founding Father to have signed all three of the fundamental documents of the United States of America, including its Declaration of Independence and Constitution, Benjamin Franklin occupies a unique position in the history of the nation. With:Simon MiddletonSenior Lecturer in American History at the University of SheffieldSimon NewmanSir Denis Brogan Professor of American History at the University of GlasgowPatricia FaraSenior Tutor at Clare College, University of Cambridge.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the physics of electrical conduction. Although electricity has been known for several hundred years, it was only in the early twentieth century that physicists first satisfactorily explained the phenomenon. Electric current is the passage of charged particles through a medium - but a material will only conduct electricity if its atomic structure enables it to do so. In investigating electrical conduction scientists discovered two new classes of material. Semiconductors, first exploited commercially in the 1950s, have given us the transistor, the solar cell and the silicon chip, and have revolutionised telecommunications. And superconductors, remarkable materials first observed in 1911, are used in medical imaging and at the Large Hadron Collider in Geneva. With:Frank CloseProfessor of Physics at the University of OxfordJenny NelsonProfessor of Physics at Imperial College LondonLesley CohenProfessor of Solid State Physics at Imperial College LondonProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the An Lushan Rebellion, a major uprising against the imperial rule of the Chinese Tang Dynasty. In 755 AD a senior general, An Lushan, orchestrated a plot against Emperor Xuanzong, taking the regime's capital city before declaring a rival dynasty in northern China. The rebellion lasted eight years but was eventually put down by Tang forces. Although the dynasty's authority was restored, it never regained the prosperity of previous generations. The An Lushan Rebellion displaced millions of people and killed many more. It changed the relationship between the Chinese state and neighbouring powers; but it also left a rich cultural legacy in the poetry memorialising this seismic event.With:Frances WoodLead Curator of Chinese at the British LibraryNaomi StandenProfessor of Medieval History at the University of BirminghamHilde de WeerdtFellow and Lecturer in Chinese History at Pembroke College, Oxford.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the life and work of the Dutch humanist scholar Desiderius Erasmus. In his lifetime Erasmus was almost universally recognised as the greatest classical scholar of his age, the translator and editor of numerous Latin and Greek texts. But above all he was a religious scholar who published important editions of the Bible which expunged many corruptions to the texts of the Scriptures. He was an outspoken critic of the Church, whose biting satire on its excesses, In Praise of Folly, was famed throughout Europe.When the Reformation began in 1517, however, Erasmus chose to remain a member of the Catholic Church rather than side with Martin Luther and the reformers, and a few years later he engaged in a celebrated debate with Luther on the subject of free will. Through his writings on the Church, on education and the wide gamut of humanist scholarship, Erasmus is remembered today as one of the greatest thinkers of the northern Renaissance.With:Diarmaid MacCullochProfessor of the History of the Church at the University of OxfordEamon DuffyProfessor of the History of Christianity at the University of CambridgeJill KrayeProfessor of the History of Renaissance Philosophy and Librarian at the Warburg Institute, University of London.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Kama Sutra, one of the most celebrated and often misunderstood texts of Indian literature. Probably composed during the reign of the Gupta dynasty around 1800 years ago, the work is a collection of writings about the art of love and sensual pleasure. Although it is best known today for a single chapter devoted to sexual pleasure, this important Sanksrit collection contains much besides. In particular it teaches the attainment of Kama (pleasure), one of the central goals of Hinduism. The Kama Sutra is a manual to a life of fulfilment, offering advice on such subjects as finding a spouse and how to behave in marriage; it has had a profound influence on Indian culture and thought. With:Julius LipnerProfessor of Hinduism and the Comparative Study of Religion at the University of CambridgeJessica FrazierLecturer in Religious Studies at the University of Kent and Research Fellow at the Oxford Centre for Hindu StudiesDavid SmithReader in South Asian Religions at the University of Lancaster.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the evolution of the Scientific Method, the systematic and analytical approach to scientific thought. In 1620 the great philosopher and scientist Francis Bacon published the Novum Organum, a work outlining a new system of thought which he believed should inform all enquiry into the laws of nature. Philosophers before him had given their attention to the reasoning that underlies scientific enquiry; but Bacon's emphasis on observation and experience is often seen today as giving rise to a new phenomenon: the scientific method.The scientific method, and the logical processes on which it is based, became a topic of intense debate in the seventeenth century, and thinkers including Isaac Newton, Thomas Huxley and Karl Popper all made important contributions. Some of the greatest discoveries of the modern age were informed by their work, although even today the term 'scientific method' remains difficult to define.With: Simon SchafferProfessor of the History of Science at the University of CambridgeJohn WorrallProfessor of the Philosophy of Science at the London School of Economics and Political ScienceMichela MassimiSenior Lecturer in the Philosophy of Science at University College London.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss 1848, the year that saw Europe engulfed in revolution. Across the continent, from Paris to Palermo, liberals rose against conservative governments. The first stirrings of rebellion came in January, in Sicily; in February the French monarchy fell; and within a few months Germany, Austria, Hungary and Italy had all been overtaken by revolutionary fervour. Only a few countries, notably Britain and Russia, were spared.The rebels were fighting for nationalism, social justice and civil rights, and were prepared to fight in the streets down to the last man. Tens of thousands of people lost their lives; but little of lasting value was achieved, and by the end of the year the liberal revolutions had been soundly beaten.With: Tim BlanningEmeritus Professor of History at the University of CambridgeLucy RiallProfessor of History at Birkbeck, University of LondonMike RapportSenior Lecturer in History at the University of Stirling.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Safavid Dynasty, rulers of the Persian empire between the 16th and 18th centuries.In 1501 Shah Ismail, a boy of fifteen, declared himself ruler of Azerbaijan. Within a year he had expanded his territory to include most of Persia, and founded a ruling dynasty which was to last for more than two hundred years. At the peak of their success the Safavids ruled over a vast territory which included all of modern-day Iran. They converted their subjects to Shi'a Islam, and so created the religious identity of modern Iran - although they were also often ruthless in their suppression of Sunni practices. They thrived on international trade, and their capital Isfahan, rebuilt by the visionary Shah Abbas, became one of the most magnificent cities in the world. Under Safavid rule Persia became a cultural centre, producing many great artists and thinkers. With:Robert GleaveProfessor of Arabic Studies at the University of ExeterEmma LoosleySenior Lecturer at the School of Arts, Histories and Cultures at the University of ManchesterAndrew NewmanReader in Islamic Studies and Persian at the University of Edinburgh.Producer: Thomas Morris.

Melvyn Bragg and guests discuss the giant molecules that form the basis of all life. Macromolecules, also known as polymers, are long chains of atoms. They form the proteins that make up our bodies, as well as many of the materials of modern life. Man's ability to mimic the structure of macromolecules has led to the invention of plastics such as nylon, paints and adhesives. Most of our clothes are made of macromolecules, and our food is macromolecular. The medical sciences are making increasingly sophisticated use of macromolecules, from growing replacement skin and bone to their increasing use in drug delivery. One of the most famous macromolecules is DNA, an infinitely more complex polymer than man has ever managed to produce. We've only known about macromolecules for just over a century, so what is the story behind them and how might they change our lives in the future?With:Tony RyanPro-Vice Chancellor for the Faculty of Science at the University of SheffieldAthene DonaldProfessor of Experimental Physics at the University of Cambridge and a Fellow of Robinson CollegeCharlotte WilliamsReader in Polymer Chemistry and Catalysis at Imperial College, London Producer: Natalia Fernandez.

Melvyn Bragg and his guests discuss Daniel Defoe's novel Robinson Crusoe. Published in 1719, it was an immediate success and is considered the classic adventure story. There are several incidents that may have inspired the tale, although none of them exactly mirrors Defoe's thrilling yet didactic narrative. The plot is now universally known - the sailor stranded on a desert island who learns to tame the environment and the native population. The character of Friday, Crusoe's trusty companion and servant, has become almost as famous as Crusoe himself and their master-servant relationship forms one of the principal themes in the novel. Robinson Crusoe has been interpreted in myriad ways, from colonial fable to religious instruction manual to capitalist tract; although arguably above all of these, it is perhaps best known today as a children's story. With:Karen O'BrienPro-Vice Chancellor for Education at the University of Birmingham Judith HawleyProfessor of Eighteenth-Century Literature at Royal Holloway, University of LondonBob OwensEmeritus Professor of English Literature at the Open UniversityProducer: Natalia Fernandez.

Melvyn Bragg and his guests discuss the Concordat of Worms. This treaty between the papacy and the Holy Roman Empire, signed in 1122, put an end, at least for a time, to years of power struggle and bloodshed. The wrangling between the German kings and the Church over who had the ultimate authority to elect bishops, use the ceremonial symbols of office in his coronation and even choose the pope himself, was responsible for centuries of discord. The hatred between the two parties reached such a pinnacle that it resulted in the virtual destruction of Rome at the hands of the Normans in 1084.Nearly forty years later Emperor Henry V and Pope Calixtus II came to a compromise; their agreement became known as the Concordat of Worms, named after the town where they met and signed the treaty. The Concordat created a historic distinction between secular power and spiritual authority, and more clearly defined the respective powers of monarchs and the Church. Although in the short term the Concordat failed to prevent further conflict, some historians believe that it paved the way for the modern nation-state.With:Henrietta LeyserEmeritus Fellow of St Peter's College, University of OxfordKate CushingReader in Medieval History at Keele University John Gillingham Emeritus Professor of History at the London School of Economics and Political Science Producer: Natalia Fernandez.

Melvyn Bragg and his guests discuss the ancient Greek philosopher Heraclitus. Writing in the 5th century BC, Heraclitus believed that everything is constantly changing or, as he put it, in flux. He expressed this thought in a famous epigram: "No man ever steps into the same river twice." Heraclitus is often considered an enigmatic thinker, and much of his work is complex and puzzling. He was critical of the poets Homer and Hesiod, whom he considered to be ignorant, and accused the mathematician Pythagoras (who may have been his contemporary) of making things up. Heraclitus despaired of men's folly, and in his work constantly strove to encourage people to consider matters from alternative perspectives. Donkeys prefer rubbish to gold, he observed, pointing out that the same thing can have different meanings to different people.Unlike most of his contemporaries he was not associated with a particular school or disciplinary approach, although he did have his followers. At times a rationalist, at others a mystic, Heraclitus is an intriguing figure who influenced major later philosophers and movements such as Plato and the Stoics.With:Angie HobbsAssociate Professor of Philosophy and Senior Fellow in the Public Understanding of Philosophy at the University of WarwickPeter AdamsonProfessor of Ancient and Medieval Philosophy at King's College LondonJames WarrenSenior Lecturer in Classics and a Fellow of Corpus Christi College, University of CambridgeProducer: Natalia Fernandez.

Melvyn Bragg and his guests discuss the life and work of the Victorian poet Christina Rossetti. Rossetti was born into an artistic family and her siblings included Dante Gabriel, one of the leading lights of the Pre-Raphaelite Brotherhood, to whose journal, 'The Germ', Christina contributed poems. She was a devout Anglican all her life and her religious beliefs are a recurring theme in her work. Christina never married, although she was engaged twice - one of her fiancés was the Pre-Raphaelite painter, James Collinson. She spent her time writing and volunteering for charitable works. It is said she even considered going to the Crimea with Florence Nightingale, but in the end ill health prevented her from doing so. Best known for her ballads and long narrative poems, she also wrote some prose and children's verses. Christina was admired by contemporaries including Swinburne, Tennyson and Elizabeth Barrett Browning. Her work was to have an influence on later writers such as Virginia Woolf and Gerard Manley Hopkins. Rossetti's poetry has a spirituality and sensitivity that has led to her redisovery in recent decades, not least by feminist critics who praise her powerful and independent poetic voice. With:Dinah BirchProfessor of English Literature and Pro-Vice Chancellor for Research at Liverpool University Rhian WilliamsLecturer in Nineteenth-Century English Literature at the University of GlasgowNicholas ShrimptonEmeritus Fellow of Lady Margaret Hall, University of Oxford Producer: Natalia Fernandez.

Melvyn Bragg and his guests discuss the revolutionary Jewish leader Judas Maccabeus. Born in the second century BC, Judas led his followers, the Maccabees, in a rebellion against the Seleucid Empire, which was attempting to impose the Greek culture and religion on the Jews. After a succession of battles he succeeded and the Seleucid king granted the Jews religious freedom. But even after that freedom was granted the struggle for political independence continued, and it was not until twenty years after Judas's death that Judaea finally became an independent state. Thanks to an extensive, if often confused, historical record of these events, the story of the Maccabees is well known. Judas Maccabeus has become a celebrated folk hero, and one of his achievements, the restoration and purification of the Temple of Jerusalem after its desecration by the Seleucids, is commemorated every year at the Jewish festival of Hanukkah.With: Helen Bond, Senior Lecturer in the New Testament at Edinburgh University Tessa Rajak, Emeritus Professor of Ancient History at the University of ReadingPhilip Alexander, Emeritus Professor of Jewish Studies at the University of ManchesterProducer: Natalia Fernandez.

Melvyn Bragg and his guests discuss the ancient Greek astronomer and mathematician Ptolemy, and consider how and why his geocentric theory of the universe held sway for so many centuries. In his seminal astronomical work, the Almagest, written in the 2nd century AD, Ptolemy proposed that the Earth was at the centre of the universe and explained all the observed motions of the Sun, Moon, planets and stars with a system of uniform circular motions which he referred to as 'epicycles'. But Ptolemy was a polymath and did not confine his study of the stars to mathematical equations. He was also interested in astrology and his book on this topic, the Tetrabiblos, tackled the spiritual aspects of the cosmos and its influence on individual lives and personalities.Ptolemy's model of the universe remained the dominant one for over a thousand years. It was not until 1543, and Copernicus's heliocentric theory of the world, that the Ptolemaic model was finally challenged, and not until 1609 that Johannes Kepler's New Astronomy put an end to his ideas for good. But how and why did Ptolemy's system survive for so long?With:Liba TaubProfessor of History and Philosophy of Science at Cambridge UniversityJim BennettDirector of the Museum of the History of Science at the University of OxfordCharles BurnettProfessor of the History of Islamic Influences on Europe at the Warburg Institute, University of LondonProducer: Natalia Fernandez.

Melvyn Bragg and his guests discuss the Continental-Analytic split in Western philosophy. Around the beginning of the last century, philosophy began to go down two separate paths, as thinkers from Continental Europe explored the legacy of figures including Friedrich Nietzsche and Martin Heidegger, while those educated in the English-speaking world tended to look to more analytically-inclined philosophers like Bertrand Russell and Gottlob Frege. But the divide between these two schools of thought is not clear cut, and many philosophers even question whether the term 'Continental' is accurate or useful.The Analytic school favours a logical, scientific approach, in contrast to the Continental emphasis on the importance of time and place. But what are the origins of this split and is it possible that contemporary philosophers can bridge the gap between the two? With:Stephen MulhallProfessor of Philosophy at New College, University of OxfordBeatrice Han-PileProfessor of Philosophy at the University of EssexHans Johann-Glock Professor of Philosophy at the University of ZurichProducer: Natalia Fernandez.

After 27 years, Melvyn Bragg has decided to step down from the In Our Time presenter’s chair. With over a thousand episodes to choose from, he has selected just six that capture the huge range and depth of the subjects he and his experts have tackled. In this first pick, we hear Melvyn Bragg and his guests discuss the origins, science and mythology of the moon. Humans have been fascinated by our only known satellite since prehistory. In some cultures the Moon has been worshipped as a deity; in recent centuries there has been lively debate about its origins and physical characteristics. Although other planets in our solar system have moons ours is, relatively speaking, the largest, and is perhaps more accurately described as a 'twin planet'; the past, present and future of the Earth and the Moon are locked together. Only very recently has water been found on the Moon - a discovery which could prove to be invaluable if human colonisation of the Moon were ever to occur. Mankind first walked on the Moon in 1969, but it is debatable how important this huge political event was in developing our scientific knowledge. The advances of space science, including data from satellites and the moon landings, have given us some startling insights into the history of our own planet, but many intriguing questions remain unanswered. With:Paul Murdin Visiting Professor of Astronomy at Liverpool John Moores UniversityCarolin Crawford Gresham Professor of Astronomy at the University of Cambridge Ian Crawford Reader in Planetary Science and Astrobiology at Birkbeck College, London.Producer: Natalia FernandezSpanning history, religion, culture, science and philosophy, In Our Time from BBC Radio 4 is essential listening for the intellectually curious. In each episode, host Melvyn Bragg and expert guests explore the characters, events and discoveries that have shaped our world.

Melvyn Bragg and his guests discuss the Siege of Tenochtitlan. In 1521 the Spanish conquistador Hernan Cortes led an army of Spanish and native forces against the city of Tenochtitlan, the spectacular island capital of the Aztec civilisation. At first Cortes had been welcomed by the Aztec leader, Moctezuma, and he and his men were treated like kings. But their friendship proved short-lived, and soon celebrations turned into vicious fighting. After a prolonged siege and fierce battle, in which many thousands died, the city finally fell. This major confrontation between Old and New Worlds precipitated the downfall of the Aztec Empire, and marked a new phase in European colonisation of the Americas.With:Alan Knight Professor of the History of Latin America at the University of OxfordElizabeth GrahamProfessor of Mesoamerican Archaeology at University College, LondonCaroline Dodds Pennock Lecturer in International History at the University of Sheffield Producer: Natalia Fernandez.

Melvyn Bragg and his guests discuss Delacroix's painting Liberty Leading the People. In 1830 revolution once more overtook France, when a popular uprising toppled the French king Charles X. A few months later, the artist Eugene Delacroix immortalised the events of the July Revolution in a painting which remains one of the icons of the age. His allegorical depiction of a Paris barricade, with the figure of Liberty clutching a tricolore while standing on a pile of corpses, is a powerful image which has provoked much debate in the years since it was first unveiled to an enthusiastic public.Producer: Natalia Fernandez.

Melvyn Bragg and his guests discuss the Ming Voyages. In 1405 a Chinese admiral, Zheng He, set sail with an enormous fleet of ships carrying more than 27,000 people. This was the first of seven voyages of discovery which took Zheng and his ships all over the known world, from India to the Gulf of Persia and as far as East Africa. They took Chinese goods, evidence of the might of the Ming Empire, to the people they visited; and they also returned to China with treasure from the places they visited, and exotic items including a live giraffe. These seven voyages were an expression of the might of the Ming Dynasty; but they were regarded by some Chinese courtiers as a wasteful extravagance, and after internal disputes they came to an end in 1433. These extraordinary journeys live on in the imagination and the historical record - and had a profound effect on China's relationship with the rest of the world.With:Rana MitterProfessor of the History and Politics of Modern China at the University of OxfordJulia LovellLecturer in Chinese History at Birkbeck College, University of LondonCraig ClunasProfessor of the History of Art at the University of Oxford.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the work of the philosopher David Hume. A key figure in the Scottish Enlightenment of the eighteenth century, Hume was an empiricist who believed that humans can only have knowledge of things they have themselves experienced. Hume made a number of significant contributions to philosophy. He saw human nature as a manifestation of the natural world, rather than something above and beyond it. He gave a sceptical account of religion, which caused many to suspect him of atheism. He was also the author of a bestselling History of England. His works, beginning in 1740 with A Treatise of Human Nature, have influenced thinkers from Adam Smith to Immanuel Kant and Charles Darwin, and today he is regarded by some scholars as the most important philosopher ever to write in English.With:Peter MillicanProfessor of Philosophy at the University of OxfordHelen BeebeeProfessor of Philosophy at the University of BirminghamJames HarrisSenior Lecturer in Philosophy at the University of St AndrewsProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the Etruscan civilisation.Around 800 BC a sophisticated civilisation began to emerge in the area of Italy now known as Tuscany. The Etruscans thrived for the next eight hundred years, extracting and trading copper and developing a sophisticated culture. They were skilled soldiers, architects and artists, and much of their handiwork survives today. They are also believed to have given us the alphabet, an innovation they imported from Greece. Eventually the Etruscan civilisation was absorbed into that of Rome, but not before it had profoundly influenced Roman art and religion, and even its politics.With:Phil PerkinsProfessor of Archaeology at the Open UniversityDavid RidgwaySenior Research Fellow at the Institute of Classical Studies at the University of LondonCorinna RivaLecturer in Mediterranean Archaeology at University College London.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Japanese belief system Shinto.A religion without gods, scriptures or a founder, Shinto is perhaps better described as a system of belief. Central to it is the idea of kami, spirits or deities associated with places, people and things. Shinto shrines are some of the most prominent features of the landscape in Japan, where over 100 million people - most of the population - count themselves as adherents.Since its emergence as a distinct religion many centuries ago, Shinto has happily coexisted with Buddhism and other religions; in fact, adherents often practise both simultaneously. Although it has changed considerably in the face of political upheaval and international conflict, it remains one of the most significant influences on Japanese culture.With:Martin PalmerDirector of the International Consultancy on Religion, Education, and CultureRichard Bowring Professor of Japanese Studies at the University of CambridgeLucia DolceSenior Lecturer in Japanese Religion and Japanese at the School of Oriental and African Studies, University of London.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Hippocratic Oath. The Greek physician Hippocrates, active in the fifth century BC, has been described as the father of medicine, although little is known about his life and some scholars even argue that he was not one person but several. A large body of work originally attributed to him, the Hippocratic Corpus, was disseminated widely in the ancient world, and contains treatises on a wide variety of subjects, from fractures to medical ethics.Today we know that the Hippocratic Corpus cannot have been written by a single author. But many of its texts shaped Western medicine for centuries. The best known is the Hippocratic Oath, an ethical code for doctors. Celebrated in the ancient world, and later referred to by Arabic scholars, it offers medics guidance on how they should behave. Although it has often been revised and adapted, the Hippocratic Oath remains one of the most significant and best known documents of medical science - but there is little evidence that it was routinely sworn by doctors until modern times. With:Vivian NuttonEmeritus Professor of the History of Medicine at University College LondonHelen KingProfessor of Classical Studies at the Open UniversityPeter PormannWellcome Trust Associate Professor in Classics and Ancient History at the University of WarwickProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the Minoan Civilisation.In 1900 the British archaeologist Arthur Evans began excavating some ancient ruins at Knossos on the island of Crete. He uncovered an enormous palace complex which reminded him of the mythical labyrinth of King Minos. Evans had in fact discovered the remnants of a Bronze Age society; in honour of Crete's legendary king he named it the Minoan Civilisation.The Minoans flourished for twelve centuries, and their civilisation was at its height around three and a half thousand years ago, when they built elaborate palaces all over the island. They were sophisticated builders and artists, and appear to have invented one of the world's earliest writing systems. Since Evans's discoveries a hundred years ago, we have learnt much about Minoan society, religion and culture - but much still remains mysterious.With:John BennetProfessor of Aegean Archaeology at Sheffield UniversityEllen AdamsLecturer in Classical Art and Archaeology at King's College LondonYannis HamilakisProfessor of Archaeology at the University of Southampton.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss Alfred, Lord Tennyson's long poem In Memoriam.In 1850, shortly before his appointment as Poet Laureate, Tennyson published a work which many critics regard as his masterpiece. In Memoriam A.H.H. was written in tribute to a close friend, Arthur Hallam, who had died seventeen years earlier. The two had met while at university in Cambridge; during one summer when Hallam was visiting Tennyson he had fallen in love with and become engaged to Tennyson's sister, Emily. When Hallam died suddenly at the age of 22 Tennyson was torn apart by grief. He started to write verses for In Memoriam almost straight away, but it was only later that he assembled these fragments into one long poem. The work is a farewell not just to Hallam but to an entire system of thought. New geological discoveries meant that Biblical certainties, such as the age of the Earth, were suddenly thrown into question. Tennyson realised that the advent of new scientific certainties meant the death of old religious ones. The work was enormously successful; one early reader was Queen Victoria, who after the death of Prince Albert wrote: "Next to the Bible, In Memoriam is my comfort".With: Dinah BirchProfessor of English Literature and Pro-Vice-Chancellor for Research at Liverpool UniversitySeamus PerryFellow and Tutor in English at Balliol College, University of OxfordJane WrightLecturer in English at the University of Bristol. Producer: Natalia Fernandez.

Melvyn Bragg and his guests discuss Malthusianism.In the eighteenth century, as expanding agriculture and industry resulted in a rapid increase in the European population, a number of writers began to consider the implications of this rise in numbers. Some argued it was a positive development, since a larger population meant more workers and thus more wealth. Others maintained that it placed an intolerable strain on natural resources.In 1798 a young Anglican priest, the Reverend Thomas Malthus, published An Essay on the Principle of Population. Malthus argued that the population was increasing exponentially, and that food production could not keep pace; eventually a crisis would ensue. He suggested that famine, disease and wars acted as a natural corrective to overpopulation, and also suggested a number of ways in which humans could regulate their own numbers. The work caused a furore and fuelled a public debate about the size and sustainability of the British population which raged for generations. It was a profoundly influential work: Charles Darwin credited Malthus with having inspired his Theory of Natural Selection.With:Karen O'BrienPro-Vice-Chancellor for Education at the University of BirminghamMark PhilpLecturer in Politics at the University of OxfordEmma GriffinSenior Lecturer in History at the University of East Anglia Producer: Thomas Morris.

Melvyn Bragg and his guests discuss John Wyclif and the Lollards.John Wyclif was a medieval philosopher and theologian who in the fourteenth century instigated the first complete English translation of the Bible. One of the most important thinkers of the Middle Ages, he also led a movement of opposition to the Roman Church and its institutions which has come to be seen as a precursor to the Reformation. Wyclif disputed some of the key teachings of the Church, including the doctrine of transubstantiation. His followers, the Lollards, were later seen as dangerous heretics, and in the fifteenth century many of them were burnt at the stake. Today Lollardy is seen as the first significant movement of dissent against the Church in England.With:Sir Anthony KennyPhilosopher and former Master of Balliol College, OxfordAnne HudsonEmeritus Professor of Medieval English at the University of OxfordRob LuttonLecturer in Medieval History at the University of NottinghamProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the origins of infectious disease. Infectious disease has been with us for millennia. There are reports of ancient outbreaks of plague in the Bible, and in numerous historical sources from China, the Middle East and Europe. Other infections, including smallpox, tuberculosis and measles, have also been known for centuries. But some diseases made their first appearances only recently: HIV emerged around a century ago, while the Ebola virus was first recorded in the 1970s.But where do the agents of disease come from, and what determines where and when new viruses and bacteria appear? Modern techniques allow scientists to trace the histories of infective agents through their genomes; the story of disease provides a fascinating microcosm of the machinery of evolution.With:Steve JonesProfessor of Genetics at University College LondonSir Roy AndersonProfessor of Infectious Disease Epidemiology at Imperial College LondonMark PallenProfessor of Microbial Genomics at the University of Birmingham.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Battle of Stamford Bridge.In the first week of 1066 the English king, Edward the Confessor, died. A young nobleman, Harold Godwinson, claimed that Edward had nominated him his successor, and seized the throne. But he was not the only claimant: in France the powerful Duke of Normandy, William, believed that he was the rightful king, and prepared to invade England.As William amassed his forces on the other side of the Channel, however, an army led by the Norwegian king Harald Hardrada invaded from the North Sea. Harold quickly marched north and confronted the Norsemen, whose leaders included his own brother Tostig. The English won an emphatic victory; but barely three weeks later Harold was dead, killed at Hastings, and the Norman Conquest had begun.With: John HinesProfessor of Archaeology at Cardiff UniversityElizabeth RoweLecturer in Scandinavian History of the Viking Age at Clare Hall, University of CambridgeStephen BaxterReader in Medieval History at King's College LondonProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the life and work of Xenophon.Xenophon, an aristocratic Athenian, was one of the most celebrated writers of the ancient world. Born in around 430 BC, he was a friend and pupil of the great philosopher Socrates. In his twenties he took part in an unsuccessful attempt to overthrow the Persian king Artaxerxes II, and played a key role in guiding the surviving Greek troops - known as the Ten Thousand - back to safety. It was a dangerous journey from deep inside hostile territory, and lasted more than a year. Xenophon's gripping account of this military campaign, the Anabasis, is one of the masterpieces of Greek literature.Xenophon went on to write a history of the Peloponnesian War and its aftermath. But he was not just a historian, and his other works include books about household management, hunting and his mentor Socrates. His advice on the education and behaviour of princes had a significant influence in Renaissance Italy, and his treatise on horsemanship is still widely read today.With:Paul CartledgeA.G. Leventis Professor of Greek Culture at Cambridge UniversityEdith HallProfessor of Classics and Drama at Royal Holloway, University of LondonSimon GoldhillProfessor in Greek Literature and Culture at the University of Cambridge and Fellow and Director of Studies in Classics at King's College.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Battle of the Little Bighorn, also known as Custer's Last Stand.In 1876 a dispute between the American federal government and Native Americans over land rights led to an armed conflict now known as the Great Sioux War. An expeditionary federal force was sent out to coerce the Native Americans into reservations, and away from the gold reserves recently discovered in their traditional homelands.One of the officers in this expeditionary force was a Civil War hero, George Custer. While en route to his arranged rendezvous, Custer unexpectedly encountered a large group of Sioux and Cheyenne warriors. Disobeying orders, he decided to attack. Barely half an hour later, he and all 200 of his men lay dead. Custer's Last Stand has become one of the most famous and closely studied military engagements in American history.With:Kathleen BurkProfessor of Modern and Contemporary History at University College, LondonAdam SmithSenior Lecturer in American History at University College LondonSaul DavidProfessor of War Studies at the University of Buckingham.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss Robert Burton's masterpiece The Anatomy of Melancholy.In 1621 the priest and scholar Robert Burton published a book quite unlike any other. The Anatomy of Melancholy brings together almost two thousand years of scholarship, from Ancient Greek philosophy to seventeenth-century medicine. Melancholy, a condition believed to be caused by an imbalance of the body's four humours, was characterised by despondency, depression and inactivity. Burton himself suffered from it, and resolved to compile an authoritative work of scholarship on the malady, drawing on all relevant sources.Despite its subject matter the Anatomy is an entertaining work, described by Samuel Johnson as the only book 'that ever took him out of bed two hours sooner than he wished to rise.' It also offers a fascinating insight into seventeenth-century medical theory, and influenced many generations of playwrights and poets.With:Julie SandersProfessor of English Literature and Drama at the University of NottinghamMary Ann LundLecturer in English at the University of LeicesterErin SullivanLecturer and Fellow at the Shakespeare Institute at the University of Birmingham.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the origins and early development of Islamic law. The legal code of Islam is known as Sharia, an Arabic word meaning "the way". Its sources include the Islamic holy book the Qur'an, the words and actions of the Prophet Muhammad, and the opinions of legal scholars. In the 7th century, Sharia started to replace the tribal laws of pre-Islamic Arabia; over the next three hundred years it underwent considerable evolution as Islam spread. By 900 a body of religious and legal scholarship recognisable as classical Sharia had emerged.With:Hugh KennedyProfessor of Arabic in the School of Oriental and African Studies at the University of LondonRobert GleaveProfessor of Arabic Studies at the University of ExeterMona SiddiquiProfessor of Islamic Studies at the University of GlasgowProducer: Thomas Morris.

Melvyn Bragg and his guests discuss one of the most famous statements in philosophy: "Cogito ergo sum".In his Discourse on the Method, published in 1637, the French polymath Rene Descartes wrote a sentence which remains familiar today even to many people who have never heard of him. "I think", he wrote, "therefore I exist". Although the statement was made in French, it has become better known in its Latin translation; and philosophers ever since have referred to it as the Cogito Argument.In his first Meditation, published ten years after the Discourse, Descartes went even further. He asserted the need to demolish everything completely and start right again from the foundations, arguing, for instance, that information from the senses cannot be trusted. The only thing he could be sure of was this: because he was thinking, he must exist. This simple idea continues to stir up enormous interest and has attracted comment from thinkers from Hobbes to Nietzsche and Sartre. With:Susan JamesProfessor of Philosophy at Birkbeck College, University of LondonJohn CottinghamProfessor Emeritus of Philosophy at the University of Reading and Professorial Research Fellow at Heythrop College, University of LondonStephen MulhallProfessor of Philosophy at the University of Oxford.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Pelagian Controversy.In the late 4th century a British monk, Pelagius, travelled to Rome, where he became a theologian and teacher, revered for his learning and ascetic lifestyle. But he soon aroused the ire of some of the Church's leading figures, preaching a Christian doctrine which many regarded as heretical. Pelagius believed that mankind was not inherently depraved, and disputed the necessity of original sin. His opinions were highly controversial and led to fierce division. Pelagius's most prominent opponent was the African bishop St Augustine of Hippo. Their dispute resulted in the persecution and eventual condemnation of Pelagius and his followers, and was to be of long-lasting significance to the future of the Church.With:Martin PalmerDirector of the International Consultancy on Religion, Education, and CultureCaroline HumfressReader in History at Birkbeck College, University of LondonJohn MilbankProfessor in Religion, Politics and Ethics and the Director of the Centre for Theology and Philosophy at Nottingham UniversityProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the neutrino.In 1930 the physicist Wolfgang Pauli proposed the existence of an as-yet undiscovered subatomic particle. He also bet his colleagues a case of champagne that it would never be detected. He lost his bet when in 1956 the particle, now known as the neutrino, was first observed in an American nuclear reactor. Neutrinos are some of the most mysterious particles in the Universe. The Sun produces trillions of them every second, and they constantly bombard the Earth and everything on it. Neutrinos can pass through solid rock, and even stars, at almost the speed of light without being impeded, and are almost impossible to detect. Today, experiments involving neutrinos are providing insights into the nature of matter, the contents of the Universe and the processes deep inside stars.With:Frank CloseProfessor of Physics at Exeter College at the University of OxfordSusan CartwrightSenior Lecturer in Particle Physics and Astrophysics at the University of SheffieldDavid WarkProfessor of Particle Physics at Imperial College, London, and the Rutherford Appleton Laboratory. Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Victorian social reformer Octavia Hill.From the 1850s until her death in 1912, Octavia Hill was an energetic campaigner who did much to improve the lot of impoverished city dwellers. She was a pioneer of social housing who believed that there were better and more humane ways of arranging accommodation for the poor than through the state. Aided at first by her friend John Ruskin, the essayist and art critic, she bought houses and let them to the urban dispossessed. Octavia Hill provided an early model of social work, did much to preserve urban open spaces, and was the first to use the term 'green belt' to describe the rural areas around London. She was also one of the founders of the National Trust. Yet her vision of social reform, involving volunteers and private enterprise rather than central government, was often at odds with that of her contemporaries.With:Dinah BirchProfessor of English Literature and Pro-Vice Chancellor for Research at Liverpool UniversityLawrence GoldmanFellow in Modern History at St Peter's College, OxfordGillian DarleyHistorian and biographer of Octavia HillProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the Bhagavad Gita.The Bhagavad Gita, a 700-verse section of the Sanskrit epic the Mahabharata, is one of the most revered texts of Hinduism. Written in around 200 BC, it narrates a conversation between Krishna, an incarnation of the deity, and the Pandava prince Arjuna. It has been described as a concise summary of Hindu theology, a short work which offers advice on how to live one's life.The Gita is also a philosophical work of great richness and influence. First translated into English in the 18th century, it was quickly taken up in the West. Its many admirers have included Mahatma Gandhi, whose passion for the work is one reason that the Bhagavad Gita became a key text for followers of the Indian Independence movement in the first half of the twentieth century.With:Chakravarthi Ram-PrasadProfessor of Comparative Religion and Philosophy at Lancaster UniversityJulius LipnerProfessor of Hinduism and the Comparative Study of Religion and Fellow of Clare Hall at the University of CambridgeJessica FrazierResearch Fellow at the Oxford Centre for Hindu Studies and Lecturer in Religious Studies at Regent's College, LondonProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the dawn of the European Iron Age.In around 3000 BC European metalworkers started to make tools and weapons out of bronze. A complex trading network evolved to convey this valuable metal and other goods around the continent. But two millennia later, a new skill arrived from the Middle East: iron smelting. This harder, more versatile metal represented a huge technological breakthrough.The arrival of the European Iron Age, in around 1000 BC, was a time of huge social as well as technological change. New civilisations arose, the landscape was transformed, and societies developed new cultures and lifestyles. Whether this was the direct result of the arrival of iron is one of the most intriguing questions in archaeology.With:Sir Barry CunliffeEmeritus Professor of European Archaeology at the University of OxfordSue HamiltonProfessor of Prehistory at University College LondonTimothy ChampionProfessor of Archaeology at the University of SouthamptonProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the medieval universities.In the 11th and 12th centuries a new type of institution started to appear in the major cities of Europe. The first universities were those of Bologna and Paris; within a hundred years similar educational organisations were springing up all over the continent. The first universities based their studies on the liberal arts curriculum, a mix of seven separate disciplines derived from the educational theories of Ancient Greece. The universities provided training for those intending to embark on careers in the Church, the law and education. They provided a new focus for intellectual life in Europe, and exerted a significant influence on society around them. And the university model proved so robust that many of these institutions and their medieval innovations still exist today.With:Miri RubinProfessor of Medieval and Early Modern History at Queen Mary, University of LondonIan WeiSenior Lecturer in Medieval European History at the University of BristolPeter DenleyReader in History at Queen Mary, University of London.Producer: Thomas Morris.

In the 500th edition of the programme, Melvyn Bragg and his guests discuss the philosophical idea of free will.Free will - the extent to which we are free to choose our own actions - is one of the most absorbing philosophical problems, debated by almost every great thinker of the last two thousand years. In a universe apparently governed by physical laws, is it possible for individuals to be responsible for their own actions? Or are our lives simply proceeding along preordained paths? Determinism - the doctrine that every event is the inevitable consequence of what goes before - seems to suggest so.Many intellectuals have concluded that free will is logically impossible. The philosopher Baruch Spinoza regarded it as a delusion. Albert Einstein wrote: "Human beings, in their thinking, feeling and acting are not free agents but are as causally bound as the stars in their motion." But in the Enlightenment, philosophers including David Hume found ways in which free will and determinism could be reconciled. Recent scientific developments mean that this debate remains as lively today as it was in the ancient world.With: Simon BlackburnBertrand Russell Professor of Philosophy at the University of CambridgeHelen BeebeeProfessor of Philosophy at the University of BirminghamGalen StrawsonProfessor of Philosophy at the University of ReadingProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the age of the Universe.Since the 18th century, when scientists first realised that the Universe had existed for more than a few thousand years, cosmologists have debated its likely age. The discovery that the Universe was expanding allowed the first informed estimates of its age to be made by the great astronomer Edwin Hubble in the early decades of the twentieth century. Hubble's estimate of the rate at which the Universe is expanding, the so-called Hubble Constant, has been progressively improved. Today cosmologists have a variety of other methods for ageing the Universe, most recently the detailed measurements of cosmic microwave background radiation - the afterglow of the Big Bang - made in the last decade. And all these methods seem to agree on one thing: the Universe has existed for around 13.75 billion years.With:Martin ReesAstronomer Royal and Emeritus Professor of Cosmology and Astrophysics at the University of CambridgeCarolin CrawfordMember of the Institute of Astronomy and Fellow of Emmanuel College at the University of CambridgeCarlos FrenkDirector of the Institute for Computational Cosmology at the University of Durham.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Taiping Rebellion.In 1850 a Chinese Christian convert, Hong Xiuquan, proclaimed himself leader of a new dynasty, the Taiping Heavenly Kingdom. He and his followers marched against the ruling Qing dynasty, gathering huge support as they went. The ensuing civil war lasted fourteen years; around twenty million people lost their lives in a conflict which eventually involved European as well as Chinese soldiers. The Taiping Rebellion was arguably the most important event to befall China in the 19th century. Chinese nationalists and communists alike have been profoundly influenced by it, and historians believe it shaped modern China in the same way as the First World War shaped modern Europe.Rana MitterProfessor of the History and Politics of Modern China at the University of OxfordFrances WoodHead of the Chinese Section at the British LibraryJulia LovellLecturer in Chinese History at Birkbeck, University of London.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the work and influence of Maimonides.Widely regarded as the greatest Jewish philosopher of the medieval period, Maimonides was also a physician and rabbinical authority. Also known as Rambam, his writings include a 14-volume work on Jewish law, the Mishneh Torah, which is still widely used today, and the Guide for the Perplexed, a central work of medieval philosophy. Although undoubtedly a titan of Jewish intellectual history, Maimonides was also profoundly influenced by the Islamic world. He exerted a strong influence on later Islamic philosophy, as well as on thinkers ranging from Thomas Aquinas to Leibniz and Newton.With:John HaldaneProfessor of Philosophy at the University of St AndrewsSarah StroumsaAlice and Jack Ormut Professor of Arabic Studies and currently Rector at the Hebrew University of JerusalemPeter AdamsonProfessor of Ancient and Medieval Philosophy at King's College London.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the nervous system.Most animals have a nervous system, a network of nerve tissues which allows parts of the body to communicate with each other. In humans the most significant parts of this network are the brain, spinal column and retinas, which together make up the central nervous system. But there is also a peripheral nervous system, which enables sensation, movement and the regulation of the major organs.Scholars first described the nerves of the human body over two thousand years ago. For 1400 years it was believed that they were animated by 'animal spirits', mysterious powers which caused sensation and movement. In the eighteenth century scientists discovered that nerve fibres transmitted electrical impulses; it was not until the twentieth century that chemical agents - neurotransmitters - were first identified.With:Colin Blakemore Professor of Neuroscience at the University of OxfordVivian Nutton Emeritus Professor of the History of Medicine at University College, LondonTilli Tansey Professor of the History of Modern Medical Sciences at Queen Mary, University of London.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Battle of Bannockburn.On June 23rd 1314, Scottish forces under their king Robert the Bruce confronted a larger army commanded by the English monarch Edward II at Bannockburn. It was the culmination of a war of independence which had been going on since the English had invaded Scotland in 1296. After eighteen years of intermittent fighting the English had been all but expelled from Scotland: their last stronghold was the castle at Stirling.The Scots won a decisive victory at Bannockburn. The English were routed and their king narrowly escaped capture. Although it took a further 14 years for Scotland to achieve full independence with the 1328 Treaty of Edinburgh-Northampton, this was an important triumph; today it remains one of the most discussed moments in the nation's history.With:Matthew StricklandProfessor of Medieval History at the University of GlasgowFiona WatsonHonorary Research Fellow in History at the University of DundeeMichael BrownReader in History at the University of St Andrews Producer: Thomas Morris.

Melvyn Bragg and his guests discuss Aristotle's Poetics. The Poetics is, as far as we know, the first ever work of literary theory. Written in the 4th century BC, it is the work of a scholar who was also a biologist, and treats literary works with the detached analytical eye of a scientist. Aristotle examines drama and epic poetry, and how they achieve their effects; he analyses tragedy and the ways in which it plays on our emotions. Many of the ideas he articulates, such as catharsis, have remained in our critical vocabulary ever since. The book also contains an impassioned defence of poetry, which had been attacked by other thinkers, including Aristotle's own teacher Plato.Translated by medieval Arab scholars, the Poetics was rediscovered in Europe during the Renaissance and became a playwriting manual for many dramatists of the era. Today it remains a standard text for would-be Hollywood screenwriters.With:Angie HobbsAssociate Professor of Philosophy and Senior Fellow in the Public Understanding of Philosophy at the University of WarwickNick LoweReader in Classical Literature at Royal Holloway, University of LondonStephen HalliwellProfessor of Greek at the University of St AndrewsProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the Mexican Revolution.In 1908 the President of Mexico, Porfirio Diaz, gave an interview to an American journalist. He was 77 and had ruled the country in autocratic fashion for over thirty years. He discussed the country's economic development and spoke of his intention to retire to his country estate after overseeing a transition to multiparty democracy.Things did not turn out quite like that. Two years later Diaz was toppled by a popular uprising. It was the beginning of a tumultuous decade in which different factions fought for supremacy, and power changed hands many times. The conflict completely changed the face of the country, and resulted in the emergence of Mexico's most celebrated folk hero: Emiliano Zapata.With:Alan KnightProfessor of the History of Latin America at the University of OxfordPaul GarnerCowdray Professor of Spanish at the University of LeedsPatience SchellSenior Lecturer in Latin American Cultural Studies at the University of Manchester. Producer: Thomas Morris.

Melvyn Bragg and his guests discuss randomness and pseudorandomness.Randomness is the mathematics of the unpredictable. Dice and roulette wheels produce random numbers: those which are unpredictable and display no pattern. But mathematicians also talk of 'pseudorandom' numbers - those which appear to be random but are not. In the last century random numbers have become enormously useful to statisticians, computer scientists and cryptographers. But true randomness is difficult to find, and mathematicians have devised many ingenious solutions to harness or simulate it. These range from the Premium Bonds computer ERNIE (whose name stands for Electronic Random Number Indicator Equipment) to new methods involving quantum physics.Digital computers are incapable of behaving in a truly random fashion - so instead mathematicians have taught them how to harness pseudorandomness. This technique is used daily by weather forecasters, statisticians, and computer chip designers - and it's thanks to pseudorandomness that secure credit card transactions are possible.With:Marcus du SautoyProfessor of Mathematics at the University of OxfordColva Roney-DougalSenior Lecturer in Pure Mathematics at the University of St AndrewsTimothy GowersRoyal Society Research Professor in Mathematics at the University of CambridgeProducer: Thomas Morris.