In Our Time

Melvyn Bragg and guests discuss the siege of Constantinople in 1453. When Sultan Mehmet the Second rode into the city of Constantinople on a white horse in 1453, it marked the end of a thousand years of the Byzantine Empire. After holding out for 53 days, the city had fallen. And as one contemporary witness described it: “The blood flowed in the city like rainwater in the gutters after a sudden storm”. It was the end of the classical world and the crowning of an Ottoman Empire that would last until 1922.Constantinople was a city worth fighting for – its position as a bridge between Europe and Asia and its triangular shape with a deep water port made it ideal both for trade and defence. It was also rumoured to harbour great wealth. Whoever conquered it would reap rewards both material and political. Earlier attempts to capture the city had largely failed – so why did the Ottomans succeed this time? What difference did the advances in weaponry such as cannons make in the outcome of the battle? And what effect did the fall of Constantinople have on the rest of the Christian world?With Roger Crowley, author and historian; Judith Herrin, Professor of Late Antique and Byzantine Studies at King's College London; Colin Imber, formerly Reader in Turkish at Manchester University.

Melvyn Bragg and guests discuss hell and its representation in literature and the visual arts, through the ages from Ancient Egypt to modern Christianity. Why do certain religions have a Satan figure and others don’t? And why did hell shift from the underworld to here on earth in 20th Century representations?A fiery vault beneath the earth or as Sartre put it, other people - it seems our ideas of hell are inevitably shaped by religious and cultural forces. For Homer and Virgil it’s a place you can visit and return from, often a wiser person for it. With Christianity it’s a one way journey and a just punishment for a sinful, unrepentant life. Writers and painters like Dante and Hieronymus Bosch gave free rein to their imaginations, depicting a complex hierarchical world filled with the writhing bodies of tormented sinners. In the 20th century hell can be found on earth in portrayals of war and the Holocaust but also in the mind, particularly in the works of TS Eliot and Primo Levi. So what is the purpose of hell and why is it found mainly in religions concerned with salvation? Why has hell proved so inspirational for artists through the ages, perhaps more so than heaven? And why do some ideas of hell require a Satan figure while others don't?With Martin Palmer, Director of the International Consultancy on Religion, Education and Culture; Margaret Kean, Tutor and Fellow in English at St Hilda’s College, Oxford; Neil MacGregor, Director of the British Museum.

Melvyn Bragg and guests discuss the contribution Indian mathematicians have made to our understanding of the subject. Mathematics from the Indian subcontinent has provided foundations for much of our modern thinking on the subject. They were thought to be the first to use zero as a number. Our modern numerals have their roots there too. And mathematicians in the area that is now India, Pakistan and Bangladesh were grappling with concepts such as infinity centuries before Europe got to grips with it. There’s even a suggestion that Indian mathematicians discovered Pythagoras’ theorem before Pythagoras. Some of these advances have their basis in early religious texts which describe the geometry necessary for building falcon-shaped altars of precise dimensions. Astronomical calculations used to decide the dates of religious festivals also encouraged these mathematical developments. So how were these advances passed on to the rest of the world? And why was the contribution of mathematicians from this area ignored by Europe for centuries?With George Gheverghese Joseph, Honorary Reader in Mathematics Education at Manchester University; Colva Roney-Dougal, Lecturer in Pure Mathematics at the University of St Andrews; Dennis Almeida, Lecturer in Mathematics Education at Exeter University and the Open University.

Melvyn Bragg and guests discuss Anarchism and why its political ideas became synonymous with chaos and disorder. Pierre Joseph Proudhon famously declared “property is theft”. And perhaps more surprisingly that “Anarchy is order”. Speaking in 1840, he was the first self-proclaimed anarchist. Anarchy comes from the Greek word “anarchos”, meaning “without rulers”, and the movement draws on the ideas of philosophers like William Godwin and John Locke. It is also prominent in Taoism, Buddhism and other religions. In Christianity, for example, St Paul said there is no authority except God. The anarchist rejection of a ruling class inspired communist thinkers too. Peter Kropotkin, a Russian prince and leading anarcho-communist, led this rousing cry in 1897: “Either the State for ever, crushing individual and local life... Or the destruction of States and new life starting again.. on the principles of the lively initiative of the individual and groups and that of free agreement. The choice lies with you!” In the Spanish Civil War, anarchists embarked on the largest experiment to date in organising society along anarchist principles. Although it ultimately failed, it was not without successes along the way.So why has anarchism become synonymous with chaos and disorder? What factors came together to make the 19th century and early 20th century the high point for its ideas? How has its philosophy influenced other movements from The Diggers and Ranters to communism, feminism and eco-warriors?With John Keane, Professor of Politics at Westminster University; Ruth Kinna, Senior Lecturer in Politics at Loughborough University; Peter Marshall, philosopher and historian.

Melvyn Bragg and guests discuss the speed of light. Scientists and thinkers have been fascinated with the speed of light for millennia. Aristotle wrongly contended that the speed of light was infinite, but it was the 17th Century before serious attempts were made to measure its actual velocity – we now know that it’s 186,000 miles per second. Then in 1905 Einstein’s Special Theory of Relativity predicted that nothing can travel faster than the speed of light. This then has dramatic effects on the nature of space and time. It’s been thought the speed of light is a constant in Nature, a kind of cosmic speed limit, now the scientists aren’t so sure. With John Barrow, Professor of Mathematical Sciences and Gresham Professor of Astronomy at Cambridge University; Iwan Morus, Senior Lecturer in the History of Science at The University of Wales, Aberystwyth; Jocelyn Bell Burnell, Visiting Professor of Astrophysics at Oxford University.

Melvyn Bragg and guests discuss altruism. The term altruism was coined by the 19th century sociologist Auguste Comte and is derived from the Latin “alteri” or "the others”. It describes an unselfish attention to the needs of others. Comte declared that man had a moral duty to “serve humanity, whose we are entirely.” The idea of altruism is central to the main religions: Jesus declared “you shall love your neighbour as yourself” and Mohammed said “none of you truly believes until he wishes for his brother what he wishes for himself”. Buddhism too advocates “seeking for others the happiness one desires for oneself.”Philosophers throughout time have debated whether such benevolence towards others is rooted in our natural inclinations or is a virtue we must impose on our nature through duty, religious or otherwise. Then in 1859 Darwin’s ideas about competition and natural selection exploded onto the scene. His theories outlined in the Origin of Species painted a world “red in tooth and claw” as every organism struggles for ascendancy.So how does this square with altruism? If both mankind and the natural world are selfishly seeking to promote their own survival and advancement, how can we explain being kind to others, sometimes at our own expense? How have philosophical ideas about altruism responded to evolutionary theory? And paradoxically, is it possible that altruism can, in fact, be selfish?With Miranda Fricker, Senior Lecturer in the School of Philosophy at Birkbeck, University of London; Richard Dawkins, evolutionary biologist and the Charles Simonyi Professor of the Public Understanding of Science at Oxford University; John Dupré, Professor of Philosophy of Science at Exeter University and director of Egenis, the ESRC Centre for Genomics in Society.

Melvyn Bragg and guests discuss the Peasants’ Revolt of 1381. “When Adam delved and Eve span, who was then the Gentleman?" these are the opening words of a rousing sermon, said to be by John Ball, which fires a broadside at the deeply hierarchical nature of fourteenth century England. Ball, along with Wat Tyler, was one of the principal leaders of the Peasants’ Revolt – his sermon ends: "I exhort you to consider that now the time is come, appointed to us by God, in which ye may (if ye will) cast off the yoke of bondage, and recover liberty". The subsequent events of June 1381 represent a pivotal and thrilling moment in England’s history, characterised by murder and mayhem, beheadings and betrayal, a boy-King and his absent uncle, and a general riot of destruction and death. By most interpretations, the course of this sensational story threatened to undermine the very fabric of government as an awareness of deep injustice was awakened in the general populace.But who were the rebels and how close did they really come to upending the status quo? And just how exaggerated are claims that the Peasants’ Revolt laid the foundations of the long-standing English tradition of radical egalitarianism? With Miri Rubin, Professor of Early Modern History at Queen Mary, University of London; Caroline Barron, Professorial Research Fellow at Royal Holloway, University of London; Alastair Dunn, author of The Peasants’ Revolt - England’s Failed Revolution of 1381.

Melvyn Bragg and guests discuss the life and work of Alexander Pope. His enemies – who were numerous - described him as a hunchbacked toad, twisted in body, twisted in mind, but Alexander Pope is without doubt one of the greatest poets of the English language. His acerbic wit and biting satire were the scourge of politicians, fellow writers and most especially the critics. He was the first Englishman to make a living from his pen, free from the shackles of patronage and flattery. Indeed, his sharp tongue meant he couldn’t go out walking without his Great Dane and a pair of loaded pistols. He was a ferocious businessman too, striking tough deals with his publishers, ensuring he kept control of his work and was well-rewarded for it. So how did Pope manage to transform himself from a crippled outsider into a major cultural and moral authority? How did he shape our ideas about what a “modern author” is? Does his work still have resonances today or is it too firmly embedded in the politics, cultural life and rivalries of the period?With John Mullan, Professor of English at University College London; Jim McLaverty, Professor of English at Keele University; Valerie Rumbold, Reader in English Literature at Birmingham University.

Melvyn Bragg and guests discuss the Poincaré Conjecture. The great French mathematician Henri Poincaré declared: “The scientist does not study mathematics because it is useful; he studies it because he delights in it, and he delights in it because it is beautiful. If nature were not beautiful, it would not be worth knowing and life would not be worth living. And it is because simplicity, because grandeur, is beautiful that we preferably seek simple facts, sublime facts, and that we delight now to follow the majestic course of the stars.” Poincaré’s ground-breaking work in the 19th and early 20th century has indeed led us to the stars and the consideration of the shape of the universe itself. He is known as the father of topology – the study of the properties of shapes and how they can be deformed. His famous Conjecture in this field has been causing mathematicians sleepless nights ever since. He is also credited as the Father of Chaos Theory.So how did this great polymath change the way we understand the world and indeed the universe? Why did his conjecture remain unproved for almost a century? And has it finally been cracked?With June Barrow-Green, Lecturer in the History of Mathematics at the Open University; Ian Stewart, Professor of Mathematics at the University of Warwick; Marcus du Sautoy, Professor of Mathematics at the University of Oxford.

Melvyn Bragg and guests discuss the French encyclopédie, the European Enlightenment in book form. One of its editors, D’Alembert, described its mission as giving an overview of knowledge, as if gazing down on a vast labyrinth of all the branches of human ideas, observing where they separate or unite and even catching sight of the secret routes between them. It was a project that attracted some of the greatest thinkers of the Enlightenment - Voltaire, Rousseau and Diderot - striving to bring together all that was known of the world in one comprehensive encyclopaedia. No subject was too great or too small, so while Voltaire wrote of “fantasie” and “elegance”, Diderot rolled up his sleeves and got to grips with jam-making.The resulting Encyclopédie was a bestseller - running to 28 volumes over more than 20 years, amidst censorship, bans, betrayals and reprieves. It even got them excited on this side of the Channel, with subscribers including Oliver Goldsmith, Samuel Johnson and Charles Burney. So what drove these men to such lengths that they were prepared to risk ridicule, prison, even exile? How did the Encyclopédie embody the values of the Enlightenment? And what was its legacy – did it really fuel the French Revolution? With Judith Hawley, Senior Lecturer in English at Royal Holloway, University of London; Caroline Warman, Fellow and Tutor in French at Jesus College, Oxford; David Wootton, Anniversary Professor of History at the University of York.

Melvyn Bragg and guests discuss the Needham Question; why Europe and not China developed modern technology. What do these things have in common? Fireworks, wood-block printing, canal lock-gates, kites, the wheelbarrow, chain suspension bridges and the magnetic compass. The answer is that they were all invented in China, a country that, right through the Middle Ages, maintained a cultural and technological sophistication that made foreign dignitaries flock to its imperial courts for trade and favour. But then, around 1700, the flow of ingenuity began to dry up and even reverse as Europe bore the fruits of the scientific revolution back across the globe. Why did Modern Science develop in Europe when China seemed so much better placed to achieve it? This is called the Needham Question, after Joseph Needham, the 20th century British Sinologist who did more, perhaps, than anyone else to try and explain it.But did Joseph Needham give a satisfactory answer to the question that bears his name? Why did China’s early technological brilliance not lead to the development of modern science and how did momentous inventions like gunpowder and printing enter Chinese society with barely a ripple and yet revolutionise the warring states of Europe? With Chris Cullen, Director of the Needham Research Institute in Cambridge; Tim Barrett, Professor of East Asian History at SOAS; Frances Wood, Head of Chinese Collections at the British Library.

Melvyn Bragg and guests discuss the Diet of Worms, an event that helped trigger the European Reformation. Nestled on a bend of the River Rhine, in the South West corner of Germany, is the City of Worms. It’s one of the oldest cities in central Europe; it still has its early city walls, its 11th century Romanesque cathedral and a 500-year-old printing industry, but in its centre is a statue of the monk, heretic and founder of the Protestant Reformation, Martin Luther. In 1521 Luther came to Worms to explain his attacks on the Catholic Church to the Holy Roman Emperor, Charles V, and the gathered dignitaries of the German lands. What happened at that meeting, called the Diet of Worms, tore countries apart, set nation against nation, felled kings and plunged dynasties into suicidal bouts of infighting. But why did Martin Luther risk execution to go to the Diet, what was at stake for the big players of medieval Europe and how did events at the Diet of Worms irrevocably change the history of Europe? With Diarmaid MacCulloch, Professor of the History of the Church at Oxford University; David Bagchi, Lecturer in the History of Christian Thought at the University of Hull; Reverend Dr Charlotte Methuen, Lecturer in Reformation History at the University of Oxford.

Melvyn Bragg and guests discuss the philosopher Averroes who worked to reconcile the theology of Islam with the rationality of Aristotle achieving fame and infamy in equal measure In The Divine Comedy Dante subjected all the sinners in Christendom to a series of grisly punishments, from being buried alive to being frozen in ice. The deeper you go the more brutal and bizarre the punishments get, but the uppermost level of Hell is populated not with the mildest of Christian sinners, but with non-Christian writers and philosophers. It was the highest compliment Dante could pay to pagan thinkers in a Christian cosmos and in Canto Four he names them all. Aristotle is there with Socrates and Plato, Galen, Zeno and Seneca, but Dante ends the list with neither a Greek nor a Roman but 'with him who made that commentary vast, Averroes'. Averroes was a 12th century Islamic scholar who devoted his life to defending philosophy against the precepts of faith. He was feted by Caliphs but also had his books burnt and suffered exile. Averroes is an intellectual titan, both in his own right and as a transmitter of ideas between ancient Greece and Modern Europe. His commentary on Aristotle was so influential that St Thomas Aquinas referred to him with profound respect as 'The Commentator'. But why did an Islamic philosopher achieve such esteem in the mind of a Christian Saint, how did Averroes seek to reconcile Greek philosophy with Islamic theology and can he really be said to have sown the seeds of the Renaissance in Europe? With Amira Bennison, Senior Lecturer in Middle Eastern and Islamic Studies at the University of Cambridge; Peter Adamson, Reader in Philosophy at King's College London; Sir Anthony Kenny, philosopher and former Master of Balliol College, Oxford.

Melvyn Bragg and guests discuss the Prussian naturalist and explorer Alexander Von Humboldt. He was possibly the greatest and certainly one of the most famous scientists of the 19th century. Darwin described him as 'the greatest scientific traveller who ever lived'. Goethe declared that one learned more from an hour in his company than eight days of studying books and even Napoleon was reputed to be envious of his celebrity.A friend of Goethe and an influence on Coleridge and Shelly, when Darwin went voyaging on the Beagle it was Humboldt's works he took for inspiration and guidance. At the time of his death in 1859, the year Darwin published On the Origin of Species, Humboldt was probably the most famous scientist in Europe. Add to this shipwrecks, homosexuality and Spanish American revolutionary politics and you have the ingredients for one of the more extraordinary lives lived in Europe (and elsewhere) in the 18th and 19th centuries. But what is Humboldt's true position in the history of science? How did he lose the fame and celebrity he once enjoyed and why is he now, perhaps, more important than he has ever been? With Jason Wilson, Professor of Latin American Literature at University College London, Patricia Fara, Affiliated Lecturer in the Department of History and Philosophy of Science at the University of Cambridge, Jim Secord, Professor in the Department of History and Philosophy of Science at the University of Cambridge and Director of the Darwin Correspondence Project.

Melvyn Bragg and guests discuss comedy in Ancient Greek theatre including Aristophanes and Menander. In The Birds, written by Aristophanes, two Athenians seek a Utopian refuge from the madness of city life and found a city of birds located between Earth and Olympus. Unfortunately, the idealism of their perfect new City - christened (in 414 BC) 'Cloud Cuckoo Land' - becomes corrupted and its decline was portrayed by one man (the chorus) playing 24 different species of bird. In one of Aristophanes' other politically anthropomorphic plays, The Wasps, was devised as an attack on the failures of Athenian democracy. It featured a chorus of actors dressed in black and yellow stripes who swarmed the stage stinging each other. Crammed with absurd images and satirical barbs, Comic theatre was a popular art form where mass appeal and coarse humour was combined with men in drag lambasting political figures and local big wigs. And from the fifth century BC onwards, Greek comic theatre fizzed and flourished, crossing boundaries of time and space, often informed by a savage political spleen. But how did Greek comedy evolve? Why did its subsequent development differ so radically from that of Greek tragedy? To what extent did it reflect the anxieties and preoccupations of a nascent democracy? And can it be said to have left any lasting legacy? With Paul Cartledge, Professor of Greek History at the University of Cambridge; Edith Hall, Professor of Drama and Classics at Royal Holloway, University of London; Nick Lowe, Senior Lecturer in Classics at Royal Holloway, University of London.

Melvyn Bragg and guests discuss pastoral literature.Come live with me and be my love, And we will all the pleasures prove That valleys, groves, hills, and fields, Woods or steepy mountain yields.And we will sit upon the rocks, Seeing the shepherds feed their flocks, By shallow rivers to whose falls Melodious birds sing madrigals. An entreaty from Christopher Marlowe's Passionate Shepherd to His Love - thought by many to be the crowning example of Elizabethan pastoral poetry. The traditions of pastoral poetry, literature and drama can be traced back to the third century BC and have principally offered a conventionalised picture of rural life, the naturalness and innocence of which is seen to contrast favourably with the corruption and artificialities of city and court life. Pastoral literature deals with tensions between nature and art, the real and the ideal, the actual and the mythical, and although pastoral works have been written from the point of view of shepherds or rustics, they have often been penned by highly sophisticated, urban poets and playwrights. But to what extent does pastoral literature represent a continuous yearning for a non-existent Golden Age of Innocence? How far did it evolve to reflect the social and political preoccupations of its times and what were the real meanings of its much used metaphors of town and country? With Helen Cooper, Professor of Medieval and Renaissance English at the University of Cambridge; Laurence Lerner, former Professor of English at the University of Sussex; Julie Sanders, Professor of English Literature and Drama at the University of Nottingham.

Melvyn Bragg and guests discuss the galaxies. Spread out across the voids of space like spun sugar, but harbouring in their centres super-massive black holes. Our galaxy is about 100,000 light years across, is shaped like a fried egg and we travel inside it at approximately 220 kilometres per second. The nearest one to us is much smaller and is nicknamed the Sagittarius Dwarf. But the one down the road, called Andromeda, is just as large as ours and, in 10 billion years, we'll probably crash into it. Galaxies - the vast islands in space of staggering beauty and even more staggering dimension. But galaxies are not simply there to adorn the universe; they house much of its visible matter and maintain the stars in a constant cycle of creation and destruction. But why do galaxies exist, how have they evolved and what lies at the centre of a galaxy to make the stars dance round it at such colossal speeds? With John Gribbin, Visiting Fellow in Astronomy at the University of Sussex; Carolin Crawford, Royal Society University Research Fellow at the Institute of Astronomy at Cambridge; Robert Kennicutt, Plumian Professor of Astronomy and Experimental Philosophy at the University of Cambridge.

Melvyn Bragg and guests discuss the Spanish Inquisition, the defenders of medieval orthodoxy. The word ‘Inquisition’ has its roots in the Latin word 'inquisito' which means inquiry. The Romans used the inquisitorial process as a form of legal procedure employed in the search for evidence. Once Rome's religion changed to Christianity under Constantine, it retained the inquisitorial trial method but also developed brutal means of dealing with heretics who went against the doctrines of the new religion. Efforts to suppress religious freedom were initially ad hoc until the establishment of an Office of Inquisition in the Middle Ages, founded in response to the growing Catharist heresy in South West France. The Spanish Inquisition set up in 1478 surpassed all Inquisitorial activity that had preceded it in terms of its reach and length. For 350 years under Papal Decree, Jews, then Muslims and Protestants were put through the Inquisitional Court and condemned to torture, imprisonment, exile and death. How did the early origins of the Inquisition in Medieval Europe spread to Spain? What were the motivations behind the systematic persecution of Jews, Muslims and Protestants? And what finally brought about an end to the Spanish Inquisition 350 years after it had first been decreed? With John Edwards, Research Fellow in Spanish at the University of Oxford; Alexander Murray, Emeritus Fellow in History at University College, Oxford;Michael Alpert, Emeritus Professor in Modern and Contemporary History of Spain at the University of Westminster

Melvyn Bragg and guests discuss Carbon. It forms the basis of all organic life and has the amazing ability to bond with itself and a wide range of other elements, forming nearly 10 million known compounds. It is in the food we eat, the clothes we wear, the shampoo we use and the petrol that fuels our cars. Because carbon has the largest range of subtle bonding capabilities, 95% of everything that exists in the universe is made up of carbon atoms that are stuck together. It is an extraordinary element for many reasons: the carbon-nitrogen cycle provides some of the energy produced by the Sun and the stars; it has the highest melting point of all the elements; and its different forms include one of the softest and one of the hardest substances known. What gives carbon its great ability to bond with other atoms? What is the significance of the recent discovery of a new carbon molecule - the C60? What role does carbon play in the modern chemistry of nanotechnology? And how should we address the problem of our diminishing carbon energy sources? With Harry Kroto, Professor of Chemistry at Florida State University; Monica Grady, Professor of Planetary and Space Sciences at the Open University; Ken Teo, Royal Academy of Engineering Research Fellow at Cambridge University.

Melvyn Bragg and guests discuss the anti slavery novel, 'Uncle Tom's Cabin'. When Abraham Lincoln met the writer Harriet Beecher Stowe after the start of the American Civil War, he reportedly said to her: 'So you're the little lady whose book started this big war'. Stowe's novel Uncle Tom's Cabin, published in 1852, is credited as fuelling the cause to abolish slavery in the northern half of the United States in direct response to its continuation in the South. The book deals with the harsh reality of slavery and the enduring power of Christian faith. It proved to be the bestselling novel of the 19th century, outselling the Bible in its first year of publication. Its fame spread internationally, No other book had portrayed an African-American slave as a central figure who was heroic and Christ-like. Lord Palmerston praised it highly and Tolstoy reportedly said it was his favourite novel. What impact did Uncle Tom's Cabin have on the on the Civil War and the abolition of slavery in 19th century America? How did the book create stereotypes about African Americans, many of which endure to this day? And what was its literary legacy? With Dr Celeste-Marie Bernier, Lecturer in American Studies at the University of Nottingham; Dr Sarah Meer, Lecturer and Director of Studies in English at Selwyn College, University of Cambridge; Dr Clive Webb, Reader in American History at the University of Sussex.

Melvyn Bragg and guests discuss the heart. Aristotle considered the heart to be the seat of thought, reason and emotion. The Roman physician Galen located the seat of the passions in the liver, the seat of reason in the brain, and considered the heart to be the seat of the emotions. It was not until the 17th century that the physician William Harvey wrote in the preface to his thesis On the Motion of the Heart and Blood in Animals, a letter addressed to King Charles I. 'The heart of animals is the foundation of their life, the sovereign of everything within them...from which all power proceeds. The King, in like manner, is the foundation of his kingdom, the sun of the world around him, the heart of the republic, the foundation whence all power, all grace doth flow'. Harvey was probably wise to address the King in this manner, for what he laid out in his groundbreaking text challenged scientific wisdom that had gone unquestioned for centuries about the true function of the heart. Organs had been seen in a hierarchical structure with the heart as the pinnacle. But Harvey transformed the metaphor into something quite different: the heart as a mechanistic pumping device. How had the Ancient Greeks and Islamic physicians understood the heart? What role did the bodily humours play in this understanding? Why has the heart always been seen as the seat of emotion and passion? And why was it that despite Harvey's discoveries about the heart and its function, this had limited implications for medical therapy and advancement? With David Wootton, Anniversary Professor of History at the University of York; Fay Bound Alberti, Research Fellow at the Wellcome Unit for the History of Medicine at the University of Manchester; Jonathan Sawday, Professor of English Studies at the University of Strathclyde.

Melvyn Bragg and guests discuss the mathematical structures that lie within the heart of music. The seventeenth century philosopher Gottfried Leibniz wrote: 'Music is the pleasure the human mind experiences from counting without being aware that it is counting'. Mathematical structures have always provided the bare bones around which musicians compose music and have been vital to the very practical considerations of performance such as fingering and tempo. But there is a more complex area in the relationship between maths and music which is to do with the physics of sound: how pitch is determined by force or weight; how the complex arrangement of notes in relation to each other produces a scale; and how frequency determines the harmonics of sound. How were mathematical formulations used to create early music? Why do we in the West hear twelve notes in the octave when the Chinese hear fifty-three? What is the mathematical sequence that produces the so-called 'golden section'? And why was there a resurgence of the use of mathematics in composition in the twentieth century? With Marcus du Sautoy, Professor of Mathematics at the University of Oxford; Robin Wilson, Professor of Pure Mathematics at the Open University; Ruth Tatlow, Lecturer in Music Theory at the University of Stockholm.

Melvyn Bragg and guests discuss the great nineteenth century political philosopher John Stuart Mill. He believed that, 'The true philosophy is the marriage of poetry and logic'. He was one of the first thinkers to argue that a social theory must engage with ideas of culture and the internal life. He used Wordsworth to inform his social theory, he was a proto feminist and his treatise On Liberty is one of the sacred texts of liberalism. J S Mill believed that action was the natural articulation of thought. He battled throughout his life for social reform and individual freedom and was hugely influential in the extension of the vote. Few modern discussions on race, birth control, the state and human rights have not been influenced by Mill's theories. How did Mill's utilitarian background shape his political ideas? Why did he think Romantic literature was significant to the rational structure of society? On what grounds did he argue for women's equality? And how did his notions of the individual become central to modern social theory? With A C Grayling, Professor of Philosophy at Birkbeck, University of London; Janet Radcliffe Richards, Reader in Bioethics at University College London; Alan Ryan, Professor of Politics at Oxford University.

Melvyn Bragg and guests discuss the literary and visual depiction of fairies, supernatural creatures that inhabit a half-way world between this one and the next.'They stole little Bridget for seven years long; When she came down again her friends were all gone. They took her lightly back, between the night and morrow; They thought that she was fast asleep, but she was dead with sorrow. They have kept her ever since deep within the lake, On a bed of flag-leaves, watching till she wake.' When the 19th century Anglo-Irish poet Richard Allingham wrote his poem The Fairies, he was replicating a belief about supernatural figures who steal children that stretched back to ancient Persian myths that date from 3000 BC. So universal is the terror of losing a child that the images of a lonely lost child and a mother who loses her child to fairies exist in civilisations everywhere. Demon Figures and Fairies have undergone a series of transformations according to their historical context, but what remains constant is their supernatural power and their association with the very human concerns of marriage, death and loss. In what way have fairies changed in guise and purpose throughout history? How did ancient fairy lore sit with the Christianity of the Middle Ages? How were fairies appropriated for the purpose of the 16th century witchcraft trials and why did fairies obsess so many Victorian artists and writers? And why is it that stories about fairies exist all over the world and what is our fascination with them?With Juliette Wood, Associate Lecturer in the Department of Welsh at Cardiff University and Secretary of the Folklore Society; Diane Purkiss, Fellow and Tutor of English at Keble College, Oxford; Nicola Bown, Lecturer in Victorian Studies at Birkbeck, University of London.

Melvyn Bragg and guests discuss the relationship between astronomy and the British Empire. The 18th century explorer and astronomer James Cook wrote: 'Ambition leads me not only farther than any other man has been before me, but as far as I think it possible for man to go'. Cook's ambition took him to the far reaches of the Pacific and led to astronomical observations which measured the distance of Venus to the Sun with unprecedented accuracy. Cook's ambition was not just personal and astronomical. It represented the colonial ambition of the British Empire which was linked inextricably with science and trade. The discoveries about the Transit of Venus, made on Cook's voyage to Tahiti, marked the beginning of a period of expansion by the British which relied on maritime navigation based on astronomical knowledge. With Simon Schaffer, Professor in History and Philosophy of Science at the University of Cambridge; Kristen Lippincott, former Director of the Royal Observatory, Greenwich; Allan Chapman, Historian of Science at the History Faculty at Oxford University.

Melvyn Bragg and guests discuss the 1851 Great Exhibition. “Its grandeur does not consist in one thing, but in the unique assemblage of all things. Whatever human industry has created you find there. It seems as if only magic could have gathered this mass of wealth from all the ends of the earth.” So wrote Charlotte Bronte in 1851 after visiting the Great Exhibition set in the vast Crystal Palace in London's Hyde Park. By the time the exhibition closed, one quarter of the entire British population had visited Crystal Palace, the first pre-fabricated building of its kind, to marvel at an extraordinary array of exhibits there. Amongst them were the biggest diamond in the world, a carriage drawn by kites, furniture made of coal, and a set of artificial teeth fitted with a swivel devise which allowed the user to yawn without displacing them. The Great Exhibition was huge in terms of the development of British manufacturing, the burgeoning of a global consumer market, the development of museums and the international standing of Britain culturally and technologically. It was also a triumph for Prince Albert and it turned a tidy profit. How did the Exhibition crystallise a particular moment in early Victorian Britain? In what way did it capitalise on the dawn of mass travel and greater levels of international co-operation? How did fears of revolutionary Europe define the policing and organisation of the event? And how far, if at all, did the Great Exhibition go in blurring class distinctions? With Jeremy Black, Professor of History at the University of Exeter; Hermione Hobhouse, Architectural Historian and Writer; Clive Emsley, Professor of History at the Open University.

Melvyn Bragg and guests discuss the search for immunisation. In 1717, Lady Mary Wortley Montagu, the wife of the British Ambassador to the Ottoman Empire, wrote a letter to her friend describing how she had witnessed the practice of smallpox inoculation in Constantinople. This involved the transfer of material from a smallpox postule into multiple cuts made in a vein. Lady Montagu had lost her brother to smallpox and was amazed that the Middle Eastern practice of inoculation rendered the fatal disease harmless. In Britain, the practice was unknown. Inoculation was an early attempt at creating immunity to disease, but was later dismissed when Edward Jenner pioneered immunisation through vaccination in 1796. Vaccination was hailed a huge success. Napoleon described it as the greatest gift to mankind, but when the British government introduced the compulsory Vaccination Act in 1853, targeted at the poor and the working class, it sparked a mass opposition movement.How did a Gloucestershire country surgeon become known as the father of vaccination? Why did the British government introduce compulsory smallpox vaccination in 1853? What were the consequences of those who opposed it? And how was the disease finally eradicated? With Nadja Durbach, Associate Professor of History at the University of Utah, Chris Dye, Co-ordinator of the World Health Organisation's work on tuberculosis epidemiology, Sanjoy Bhattacharya, Lecturer in the Wellcome Trust Centre for the History of Medicine at UCL

Melvyn Bragg and guests discuss the Oxford Movement in the Church of England in the 19th century. Cardinal John Henry Newman is perhaps the most significant Christian theologian of the nineteenth century. He began as an evangelical, becoming a High Anglican before converting to Roman Catholicism in 1845. His is the story of the diversity of Victorian religious life. But his path also marks the waning of the ideas of Protestant nationhood at the close of the eighteenth century and the reaffirmation of the Catholic tradition at the turn of the twentieth century. For over a decade, between 1833 and 1845, Newman and his fellow travellers, the Oxford Movement, argued that the Church of England was a holy Catholic and Apostolic Church. They sought to assert the Catholic nature of their Church just as secularism, liberalism, non-conformism, and even Roman Catholicism, seemed to threaten her. They published tracts, preached and brought their social mission to some of the poorest urban parishes. Why between 1833 and 1845 was the voice of reaction such a loud one? What was the Oxford Movement and what motivated them? How did they present their ideas to the Anglican clergy at large and what did the clergy make of them? And why did they leave such a powerful legacy for the Church of England, its character and its churches? With Sheridan Gilley, Emeritus Reader in Theology at the University of Durham; Frances Knight, Senior Lecturer in Church History at the University of Wales, Lampeter; Simon Skinner, Fellow and Tutor in History at Balliol College, Oxford.

Melvyn Bragg and guests discuss Johann Wolfgang Goethe, the great German polymath. 'I had the great advantage of being born at a time that was ripe for earth-shaking events which continued throughout my long life, so that I witnessed the Seven Years War...the French Revolution, and the whole Napoleonic era down to the defeat of the hero and what followed after him. As a result I have attained completely different insights and conclusions than will ever be possible for people who are born now...' Goethe's friend Johann Peter Eckermann recorded these remarks made by the great writer at the end of his life in a series of published recollections. Goethe's life was indeed remarkable. At the age of twenty-five he was author of the first German international best-seller The Sorrows of Young Werther. A year later, he was invited by the Grand Duke to join him at the Imperial Court as Privy Councillor where he oversaw commissions on war, roads and tax. He rode to war with the Prussian Army against the French and embarked on a remarkable creative friendship with Schiller which saw the establishment of a new form of German theatre. What made Goethe the dominant cultural icon of his time and after? What links were there between his interest in politics and the arts? Why did he support Napoleon despite the French invasion of Weimar? How did his relationships with women define his work? And how was he able to transform the status of the German language? With Tim Blanning, Professor of Modern European History at the University of Cambridge; Sarah Colvin, Professor of German at the University of Edinburgh; W. Daniel Wilson, Professor of German at Royal Holloway, University of London.

Melvyn Bragg and guests discuss the Holy Roman Emperor Charlemagne and the Carolingian Renaissance. In 800 AD on Christmas Day in Rome, Pope Leo III proclaimed Charlemagne Emperor. According to the Frankish historian Einhard, Charlemagne would never have set foot in St Peter's that day if he had known that the Pope intended to crown him. But Charlemagne accepted his coronation with magnanimity. Regarded as the first of the Holy Roman Emperors, Charlemagne became a touchstone for legitimacy until the institution was brought to an end by Napoleon in 1806. A Frankish King who held more territory in Western Europe than any man since the Roman Emperor, Charlemagne's lands extended from the Atlantic to Vienna and from Northern Germany to Rome. His reign marked a period of enormous cultural and literary achievement. But at its foundation lay conquest, conversion at the point of a sword and a form of Christianity that was obsessed with sin, discipline and correction. How did Charlemagne become the most powerful man in Western Europe and how did he finance his conquests? Why was he able to draw Europe's most impressive scholars to his court? How successful was he in his quest to reform his church and educate the clergy? And can the Carolingian period really be called a Renaissance? With Matthew Innes, Professor of History at Birkbeck, University of London; Julia Smith, Edwards Professor of Medieval History at Glasgow University; Mary Garrison, Lecturer in History at the University of York

Melvyn Bragg and guests discuss the formation of the Royal Society. In the 17th century the natural philosopher Francis Bacon heralded the new age of science. The frontispiece to his 1620 edition of the Instauratio Magna depicted a galleon travelling between the metaphorical Pillars of Hercules thought to lie at the Strait of Gibraltar and believed to mark the end of the known world. The image encapsulated Bacon's desire to sail beyond the limits set by Aristotle and the curriculum of the Ancient universities towards the new continent of science. Bacon imagined practical scientists engaged in a collaborative effort to expand knowledge of the natural world. But it was not until the turbulence of the Civil War and Commonwealth years had passed that such a group of scientists would gather together in London for this purpose, and form the Royal Society. Amongst its members were Robert Boyle, Robert Hooke, Christopher Wren and Isaac Newton, who explicitly rejected dogma and insisted on practical experimentation and observation. How was the Royal Society formed against a backdrop of religious and political strife? What was it about the way this group of men worked that allowed each individual to flourish in his own field? How successful was the Royal Society in disseminating the benefits of experimental science and what is its enduring legacy? With Stephen Pumfrey, Senior Lecturer in the History of Science at the University of Lancaster; Lisa Jardine, Professor of Renaissance Studies at Queen Mary, University of London; Michael Hunter, Professor of History at Birkbeck, University of London.

Melvyn Bragg and guests discuss Miguel de Cervantes’ 17th century novel, Don Quixote. Published four hundred years ago in Madrid, the book was an immediate success and recognised as one of the classic texts of Western Literature, revered by writers such as Sterne, Goethe, Flaubert, Dostoevsky, Kafka and Melville. Don Quixote tells the story of an unlikely hero - an impoverished country gentleman who goes mad from reading too much and decides to put the world to rights by becoming a knight errant. And so the Knight of La Mancha tilting at windmills with his portly squire astride a donkey is one of the most enduring images in the popular imagination but the simple comedy of the affair belies the fantastically complex, beguiling and sophisticated story on which it is based. As Don Quixote's delusional chivalric ideals bump up against the humdrum of reality and the views of his more earth-bound companion, Sancho Panza.So how has the book endured over the centuries? What was the relationship between Cervantes' work and the world of 17th century Spain in which he lived? In what ways was Don Quixote an interpretation of the age which hitherto had not been articulated? And can it live up to the claim that it was the first European novel?With Barry Ife, Cervantes Professor Emeritus at King's College London; Edwin Williamson, Professor of Spanish Studies at the University of Oxford; Jane Whetnall, Senior Lecturer in Hispanic Studies at Queen Mary, University of London.

Melvyn Bragg and guests discuss negative numbers, a history of mystery and suspicion. In 1759 the British mathematician Francis Maseres wrote that negative numbers "darken the very whole doctrines of the equations and make dark of the things which are in their nature excessively obvious and simple". Because of their dark and mysterious nature, Maseres concluded that negative numbers did not exist, as did his contemporary, William Friend. However, other mathematicians were braver. They took a leap into the unknown and decided that negative numbers could be used during calculations, as long as they had disappeared upon reaching the solution. The history of negative numbers is one of stops and starts. The trailblazers were the Chinese who by 100 BC were able to solve simultaneous equations involving negative numbers. The Ancient Greeks rejected negative numbers as absurd, by 600 AD, the Indians had written the rules for the multiplication of negative numbers and 400 years later, Arabic mathematicians realised the importance of negative debt. But it wasn't until the Renaissance that European mathematicians finally began to accept and use these perplexing numbers. Why were negative numbers considered with such suspicion? Why were they such an abstract concept? And how did they finally get accepted? With Ian Stewart , Professor of Mathematics at the University of Warwick; Colva Roney-Dougal , Lecturer in Pure Mathematics at the University of St Andrews; Raymond Flood , Lecturer in Computing Studies and Mathematics at Kellogg College, Oxford.

Melvyn Bragg and guests discuss the concept of friendship. In Greek and Roman times, friendship was thought of as being an essential constituent of both a good society and a good life; a good society because it lay at the heart of participative civic democracy; a good life because it nurtured wisdom and happiness. It is this period which gives us the texts on friendship which, to this day, are arguably the most important of their kind. Amongst their authors is Aristotle, who engaged in one of the great philosophical discussions on the subject. For Aristotle, friendship could fall into three categories: it could be based on utility, pleasure or goodness. In its latter state, Aristotle described it as being 'a single soul dwelling in two bodies'. So how did the Ancients establish the parameters of the true nature of friendship in the literature and philosophy that followed? How have different forms of friendship helped or hindered creativity and intellectual pursuit? What has been the apparent relationship between friendship and power? And what of the darker aspects of friendship - jealousy, envy and exploitation? With Angie Hobbs, Lecturer in Philosophy at the University of Warwick; Mark Vernon, Visiting Lecturer in Philosophy at Syracuse University and London Metropolitan University; John Mullan, Professor of English at University College London.

Melvyn Bragg and guests discuss Catherine the Great. In Moscow's Tretyakov Gallery hangs perhaps the most well-known picture of Russia's most well-known ruler. Dimitri Levitsky's 1780 'Portrait of Catherine the Great in the Justice Temple' depicts Catherine in the temple burning poppies at an altar, symbolising her sacrifice of self-interest for Russia. Law books and the scales of justice are at her feet, highlighting her respectful promotion of the rule of law. But menacingly, in the background an eagle crouches, suggesting the means to use brutal power where necessary. For an obscure, small-town German princess Catharine’s ambition was large - the transformation of semi-barbaric Russia into a model of the ideals of the French 18th century Enlightenment. How far was Catherine able to lead her country into full participation in the political and cultural life of Europe? Was she able to liberate the serfs? And should she be remembered as Russia's most civilised ruler or a megalomaniacal despot? With Janet Hartley, Professor of International History at the London School of Economics; Simon Dixon, Professor of Modern History at the University of Leeds; Tony Lentin, Professor of History at the Open University.

Melvyn Bragg and guests discuss the story of human evolution, which stretches back over six million years. It is not the story of one species but of several diverse species, some of whom walked the Earth at the same time. From the earliest hominids to the early Homo sapiens, there was nothing inevitable about the course of human evolution. But what conditions created the opportunity for diverse human species to thrive? What environmental factors led to the survival of one human species, but contributed to the extinction of so many others? What can the fossil record and the science of genetics tell us about our ancestors? How does the brain make modern man so unique in the natural world? With Steve Jones, Professor of Genetics in the Galton Laboratory at University College London; Fred Spoor, Professor of Evolutionary Anatomy at University College London; Margaret Clegg, Honorary Research Fellow in the Department of Biological Anthropology at University College London.

Melvyn Bragg and guests discuss Geoffrey Chaucer, often called the father of English literature."In Southwark at the Tabard as I lay Redy to wenden on my pilgrymage To Canterbury with ful devout corage, At nyght was come into that hostelrye Wel nyne and twenty in a compaignye Of sundry folk, by aventure yfalle In felaweshipe, and pilgrims were they alle, That toward Canterbury wolden ryde." Geoffrey Chaucer immortalised the medieval pilgrimage and the diversity of 14th century English society in his Canterbury Tales. As each pilgrim takes his, or her, turn to tell their tale on the road to Canterbury, Chaucer brings to life the voices of a knight, a miller, a Wife of Bath and many more besides. Chaucer was born the son of a London vintner, yet rose to high office in the court of Richard II. He travelled throughout France and Italy where he came into contact with the works of Dante, Boccaccio, Machaut and Froissart. He translated Boethius, wrote dream poetry, a defence of women and composed the tragic masterpiece Troilus and Criseyde. As well as the father of English literature, Chaucer was also a philosopher, bureaucrat, courtier and diplomat.So what do we know of Chaucer? How did he introduce the themes of continental writing to an English speaking audience? And why does his poetry still seem to speak so directly to us today? With Carolyne Larrington, Tutor in Medieval English at St John's College, Oxford; Helen Cooper, Professor of Medieval and Renaissance English at the University of Cambridge; Ardis Butterfield, Reader in English at University College London.

Melvyn Bragg and guests discuss the Abbasid Caliphs, dynastic rulers of the Islamic world from the mid eighth to the tenth century. They headed a Muslim empire that extended from Tunisia through Egypt, Syria, Arabia, and Persia to Uzbekistan and the frontiers of India. But unlike previous conquerors, the Abbasid Caliphs presided over a multicultural empire where conversion was a relatively peaceful business. As Vikings raided the shores of Britain, the Abbasids were developing sophisticated systems of government, administration and court etiquette. Their era saw the flowering of Arabic philosophy, mathematics and Persian literature. The Abbasids were responsible for patronising the translation of Classical Greek texts and transmitting them back to a Europe emerging from the Dark Ages. So who were the Abbasid Caliphs and how did they come to power? What was their cultural significance? What factors can account for their decline and fall? And why do they represent a Golden Age of Islamic civilisation? With Hugh Kennedy, Professor of History at the University of St Andrews; Robert Irwin, Senior Research Associate at the School of Oriental and African Studies; University of London; Amira Bennison, Senior Lecturer in Middle Eastern and Islamic Studies at the University of Cambridge.

Melvyn Bragg and guests discuss 17th century print culture."Away ungodly Vulgars, far away, Fly ye profane, that dare not view the day, Nor speak to men but shadows, nor would hear Of any news, but what seditious were, Hateful and harmful and ever to the best, Whispering their scandals ... " In 1614 the poet and playwright George Chapman poured scorn on the popular appetite for printed news. However, his initial scorn did not stop him from turning his pen to satisfy the public's new found appetite for scandal. From the advent of the printing press the number of books printed each year steadily increased, and so did literacy rates. With a growing and socially diverse readership appearing over the sixteenth and seventeenth centuries, printed texts reflected controversy in every area of politics, society and religion. In the advent of the Civil War, print was used as the ideological battleground by the competing forces of Crown and Parliament. What sorts of printed texts were being produced? How widespread was literacy and who were the new consumers of print? Did print affect social change? And what role did print play in the momentous English Civil War? With Kevin Sharpe, Professor of Renaissance Studies at Queen Mary, University of London; Ann Hughes, Professor of Early Modern History at the University of Keele; Joad Raymond, Professor of English Literature at the University of East Anglia.

Melvyn Bragg and guests discuss relativism, a philosophy of shifting sands. "Today, a particularly insidious obstacle to the task of educating is the massive presence in our society and culture of that relativism which, recognizing nothing as definitive, leaves as the ultimate criterion only the self with its desires. And under the semblance of freedom it becomes a prison for each one, for it separates people from one another, locking each person into his or her own 'ego'." Pope Benedict XVI, in a speech given in June 2005, showed that the issue of relativism is as contentious today as it was in Ancient Greece, when Plato took on the relativist stance of Protagoras and the sophists. Relativism is a school of philosophical thought which holds to the idea that there are no absolute truths. Instead, truth is situated within different frameworks of understanding that are governed by our history, culture and critical perspective. Why has relativism so radically divided scholars and moral custodians over the centuries? How have its supporters answered to criticisms that it is inherently unethical? And if there are universal standards such as human rights, how do relativists defend culturally specific practices such as honour killings or female infanticide? With Barry Smith, Senior Lecturer in Philosophy at Birkbeck College, University of London; Jonathan Rée, freelance philosopher who holds visiting professorships at the Royal College of Art and Roehampton University; Kathleen Lennon, Senior Lecturer in Philosophy at the University of Hull.

Melvyn Bragg and guests discuss prime numbers: 2, 3, 5, 7, 11, 13, 17 … This sequence of numbers goes on literally forever. Recently, a team of researchers in Missouri successfully calculated the highest prime number - it has 9.1 million digits. For nearly two and a half thousand years, since Euclid first described the prime numbers in his book Elements, mathematicians have struggled to write a rule to predict what comes next in the sequence. The Swiss mathematician Leonhard Euler feared that it is "a mystery into which the human mind will never penetrate." But others have been more hopeful... In the middle of the nineteenth century, the German mathematician Bernhard Riemann discovered a connection between prime numbers and a complex mathematical function called the 'zeta function'. Ever since, mathematicians have laboured to prove the existence of this connection and reveal the rules behind the elusive sequence. What exactly are prime numbers and what secrets might they unlock about our understanding of atoms? What are the rules that may govern the prime sequence? And is it possible that the person who proves Riemann's Hypothesis may bring about the collapse of the world financial system? With Marcus du Sautoy, Professor of Mathematics and Fellow of Wadham College at the University of Oxford; Robin Wilson, Professor of Pure Mathematics at the Open University and Gresham Professor of Geometry; Jackie Stedall, Junior Research Fellow in the History of Mathematics at Queen's College, Oxford.

Melvyn Bragg and guests discuss the importance of the oath in ancient Greece and Rome, The importance of oaths in the Classical world cannot be overstated. Kings, citizens, soldiers, litigants all swore oaths, inviting divine retribution if they proved false to their word. Oaths cemented peace treaties, they obliged the Athenian citizenry to protect their democracy, they guaranteed the loyalty of the Roman army to its Emperor and they underpinned the legal systems of Athens and Rome. And in Homer's epic poem, The Iliad, it is a broken oath to settle the dispute between Menelaus and Paris that leads the Greeks to storm Troy in pursuit of Helen. But how did the Classical world come to understand the oath? Why did oaths come to occupy such a central place in the political, social and legal life of the Athenian State? And what role did oath-making play in the expanding Roman Empire? With Alan Sommerstein , Professor of Greek at the University of Nottingham;Paul Cartledge , Professor of Greek History at the University of Cambridge; Mary Beard , Professor in Classics at the University of Cambridge

Melvyn Bragg and guests discuss the ‘Oresteia’, the seminal trilogy of tragedies by Aeschylus. The composer Richard Wagner recalled the visceral sensations of reading Aeschylus' great trilogy for the first time. "I could see the Oresteia with my mind's eye ... Nothing could equal the sublime emotion with which the Agamemnon inspired me; and to the last word of the Eumenides, I remained in an atmosphere so far removed from the present day that I have never since been really able to reconcile myself with modern literature." Aeschylus' audience were all familiar with the tale of one man's return home from the Trojan War. Homer's Odyssey recounted Odysseus' perilous journey home, the forceful ejection of the suitors from his household and his reunion with wife Penelope and son Telemachus. Aeschylus had a very different tale of homecoming to tell in his Oresteia. Agamemnon arrives home from Troy to a murderous welcome from a vengeful wife and a cycle of atrocities unfolds in his household. The Oresteia has inspired some of the greatest artists and thinkers of the modern world. From Richard Wagner and Friedrich Nietzsche to T.S. Eliot and Simone de Beauvoir – the ‘Oresteia’ has fired the modern imagination.Why did Aeschylus make the family the subject of his bloody revenge tragedy? How did his trilogy make a contribution to the development of Athenian legal institutions? And why has the Oresteia had such a powerful hold over the modern imagination? With Edith Hall, Professor of Greek Cultural History at Durham University; Simon Goldhill, Professor of Greek at the University of Cambridge; Tom Healy, Professor of Renaissance Studies at Birkbeck College, University of London.

Melvyn Bragg and guests discuss ideas of heaven and the afterlife. The great medieval theologian Thomas Aquinas wrote 'that in the end language can only be related to what is experienced here, and given that the hereafter is not here, we can only infer'. Aquinas encapsulated a great human conundrum that has preoccupied writers and thinkers since ancient times: what might heaven be like. And although human language is constrained by experience, this has not stopped an outpouring of artistic, theological and literary representations of heaven. In the early Middle Ages men ascended up a ladder to heaven. In his Divine Comedy, Dante divided heaven into ten layers encompassing the planets and the stars. And the 17th century writer John Bunyan saw the journey of the soul to heaven as a spiritual struggle in his autobiography, The Pilgrim's Progress. But what exactly is heaven and where is it? How does the Protestant conception of the afterlife differ from the Catholic conception? How does one achieve salvation and what do the saved do when they get there? And, if heaven is so interesting, why has western culture been so spellbound by hell? With Valery Rees, Renaissance scholar and senior member of the Language Department at the School of Economic Science; Martin Palmer, Theologian and Director of the International Consultancy on Religion, Education and Culture; John Carey, Emeritus Professor of English Literature at Oxford University.

Melvyn Bragg and guests discuss the Peterloo Massacre in 1819, a defining moment of its age. In 1819 Percy Bysshe Shelley wrote: 'I met Murder on the way He had a mask like Castlereagh Very smooth he looked, yet grim; Seven blood-hounds followed him: All were fat; and well they might Be in admirable plight, For one by one, and two by two, He tossed them human hearts to chew Which from his wide cloak he drew.' As Foreign Secretary, Castlereagh had successfully co-ordinated European opposition to Napoleon, but at home he had repressed the Reform movement, and popular opinion held him responsible for the Peterloo Massacre of peaceful demonstrators in 1819. Shelley's epic poem, The Mask of Anarchy, reflected the widespread public outrage and condemnation of the government's role in the massacre. Why did a peaceful and orderly meeting of men, women and children in St Peter's Field, Manchester turn into a blood bath? How were the stirrings of radicalism in the wake of the Napoleonic Wars dealt with by the British establishment? And what role did the Peterloo Massacre play in bringing about the Great Reform Act of 1832? With Jeremy Black, Professor of History at the University of Exeter; Sarah Richardson, Senior Lecturer in History at the University of Warwick; Clive Emsley, Professor of History at the Open University.

Melvyn Bragg and guests discuss artificial intelligence. Can machines think? It was a question posed by the mathematician and Bletchley Park code breaker Alan Turing and it is a question still being asked today. What is the difference between men and machines and what does it mean to be human? And if we can answer that question, is it possible to build a computer that can imitate the human mind? There are those who have always had robust answers to the questions that those who seek to create artificial intelligence have posed. In 1949 the eminent neurosurgeon, Professor Geoffrey Jefferson argued that the mechanical mind could never rival a human intelligence because it could never be conscious of what it did: "Not until a machine can write a sonnet or compose a concerto because of thoughts and emotions felt", he declared "and not by the chance fall of symbols, could we agree that machine equals brain - that is, not only write it but know that it had written it." Yet the quest rolled on for machines that were bigger and better at processing symbols and calculating infinite permutations. Who were the early pioneers of artificial intelligence and what drove them to imitate the operations of the human mind? Is intelligence the defining characteristic of humanity? And how has the quest for artificial intelligence been driven by warfare and conflict in the twentieth century? With Jon Agar, Lecturer in the History and Philosophy of Science, University of Cambridge; Alison Adam, Professor of Information Systems, Salford University; Igor Aleksander, Professor of Neural Systems Engineering at Imperial College, University of London.

Melvyn Bragg and guests discuss the great 17th century political philosopher Thomas Hobbes who argued: "During the time men live without a common power to keep them all in awe, they are in that condition which is called war; and such a war as is of every man against every man". For Hobbes, the difference between order and disorder was stark. In the state of nature, ungoverned man lived life in "continual fear, and danger of violent death". The only way out of this "solitary, poor, nasty, brutish, and short" existence, he said, was to relinquish all your freedom and submit yourself to one all powerful absolute sovereign. Hobbes' proposal, contained in his controversial and now classic text, Leviathan, was written just as England was readjusting to life after the Civil War and the rule of Oliver Cromwell. In fact, in his long life Hobbes’ allegiance switched from Charles I to Cromwell and back to Charles II. But how did the son of a poor clergyman end up as the most radical thinker of his day? Why did so many of Hobbes' ideas run counter to the prevailing fondness for constitutionalism with a limited monarchy? And why is he regarded by so many political philosophers as an important theorist when so few find his ideas convincing? With Quentin Skinner, Regius Professor of History at the University of Cambridge; David Wootton, Professor of History at the University of York; Annabel Brett, Senior Lecturer in Political Thought and Intellectual History at Cambridge University.

Melvyn Bragg and guests discuss the search for the Graviton particle. Albert Einstein said "I know why there are so many people who love chopping wood. In this activity one immediately sees the results". Einstein spent the last thirty years of his life trying to find a theory that would unify electromagnetism with gravity, but success eluded him. The search is still on for a unifying theory of gravitational force and hopes are pinned on the location of the graviton - a hypothetical elementary particle that transmits the force of gravity. But the graviton is proving hard to find. Indeed, the Large Hadron Collider at CERN still won't allow us to detect gravitons per se, but might be able to prove their existence in other ways. The idea of the graviton particle first emerged in the middle of the 20th century, when the notion that particles as mediators of force was taken seriously. Physicists believed that it could be applicable to gravity and by the late 20th century the hunt was truly on for the ultimate theory, a theory of quantum gravity. So why is the search for the graviton the major goal of theoretical physics? How will the measurement of gravitation waves help prove its existence? And how might the graviton unite the seemingly incompatible theories of general relativity and quantum mechanics? With Roger Cashmore, Former Research Director at CERN and Principal of Brasenose College, Oxford; Jim Al-Khalili, Professor of Physics at the University of Surrey; Sheila Rowan, Reader in Physics in the Department of Physics and Astronomy at the University of Glasgow.

Melvyn Bragg and guests discuss the American philosophy of pragmatism. A pragmatist "turns away from abstraction and insufficiency, from verbal solutions, from bad apriori reasons, from fixed principles, closed systems, and pretended absolutes and origins. He turns towards concreteness and adequacy, towards facts, towards action and towards power". A quote from William James' 1907 treatise Pragmatism: A New Name for Some Old Ways of Thinking. William James, along with John Dewey and Charles Sanders Peirce, was the founder of an American philosophical movement which flowered during the last thirty years of the nineteenth century and the first twenty years of the 20th century. It purported that knowledge is only meaningful when coupled with action. Nothing is true or false - it either works or it doesn't. It was a philosophy which was deeply embedded in the reality of life, concerned firstly with the individual's direct experience of the world he inhabited. In essence, practical application was all. But how did Pragmatism harness the huge scientific leap forward that had come with Charles Darwin's ideas on evolution? And how did this dynamic new philosophy challenge the doubts expressed by the Sceptics about the nature and extent of knowledge? Did Pragmatism influence the economic and political ascendancy of America in the early 20th century? And did it also pave the way for the contemporary preoccupation with post-modernism? With A C Grayling, Professor of Applied Philosophy at Birkbeck College, University of London and a Fellow of St Anne's College, Oxford; Julian Baggini, editor of The Philosophers' Magazine; Miranda Fricker, Lecturer in Philosophy at Birkbeck College, University of London.

Melvyn Bragg and guests discuss the religious orders of the Dominicans and the Franciscans, known as the Blackfriars and Greyfriars. "Just as it is better to light up others than to shine alone, it is better to share the fruits of one's contemplation with others than to contemplate in solitude". Thus St Thomas Aquinas described his vocation, not only as a teacher, but also as a Dominican friar and philosopher at the University of Paris. In the 13th century, the religious orders of the Dominicans and the Franciscans were a great force for change in Catholic Europe. They thrived in the emerging towns and cities of the High Middle Ages, leading crusades and changing the way the Church dealt with heretics. They were the evangelists who transformed the Church's preaching of the Christian message to the people. On top of all this, these two orders were also responsible for reconciling Classical and Christian philosophy; their studies of Aristotle paved the way for the Renaissance. They also managed to change the curriculum at the universities of Paris and Oxford. But the Blackfriars and the Greyfriars did not come from the great monasteries of the time; they started out as itinerant preachers surviving upon the charity of the faithful. So how did these two orders come to dominate the spiritual and academic life of the 13th century, and how did they manage to accumulate such huge wealth while professing allegiance to lives of poverty? With Henrietta Leyser, medieval historian and Fellow of St Peter's College, Oxford; Alexander Murray, medieval historian and Emeritus Fellow of University College, Oxford; Anthony Kenny, philosopher and former Master of Balliol College, Oxford.