In Our Time

Melvyn Bragg and guests discuss an iconic piece of 20th century maths - Gödel’s Incompleteness Theorems. In 1900, in Paris, the International Congress of Mathematicians gathered in a mood of hope and fear. The edifice of maths was grand and ornate but its foundations, called axioms, had been shaken. They were deemed to be inconsistent and possibly paradoxical. At the conference, a young man called David Hilbert set out a plan to rebuild the foundations of maths – to make them consistent, all encompassing and without any hint of a paradox. Hilbert was one of the greatest mathematicians that ever lived, but his plan failed spectacularly because of Kurt Gödel. Gödel proved that there were some problems in maths that were impossible to solve, that the bright clear plain of mathematics was in fact a labyrinth filled with potential paradox. In doing so Gödel changed the way we understand what mathematics is and the implications of his work in physics and philosophy take us to the very edge of what we can know.With Marcus du Sautoy, Professor of Mathematics at Wadham College, University of Oxford; John Barrow, Professor of Mathematical Sciences at the University of Cambridge and Gresham Professor of Geometry and Philip Welch, Professor of Mathematical Logic at the University of Bristol.

Melvyn Bragg and guests discuss one of the greatest intellectual projects in history - the mass translation of Greek ideas into Arabic from the 9th century onwards.One night in Baghdad, the 9th century Caliph Al-Mamun was visited by a dream. The philosopher Aristotle appeared to him, saying that the reason of the Greeks and the revelation of Islam were not opposed. On waking, the Caliph demanded that all of Aristotle’s works be translated into Arabic. And they were. And it wasn’t just Aristotle. Over the next 200 years Greek philosophy, medicine, engineering and maths were all poured and sometimes squeezed into Arabic. Centred on Baghdad, this translation movement introduced the Islamic world to the philosophy of Aristotle, the geometry of Euclid and the Medicine of Galen. It caused an intellectual ferment that demanded the creation of new words to explain new concepts and house new arguments. Over 600 years before the European renaissance the intellectual legacy of Greece was woven into the tapestry of Arabic thought and it was only through the Arabic versions that Europe go its hands on many Greek ideas. With Peter Adamson, Reader in Philosophy at King’s College London; Amira Bennison, Senior Lecturer in Middle Eastern and Islamic Studies at the University of Cambridge; and Peter Pormann, Wellcome Trust Assistant Professor in Classics and Ancient History at the University of Warwick

Melvyn Bragg and guests discuss the parting of the Red Sea, the feeding of the five thousand and the general subject of miracles. Miracles have been part of human culture for thousands of years. From St Augustine in the 4th century through the medieval cult of saints to David Hume in the 18th, miracles have captured the imaginations of believers and sceptics alike. The way they have been celebrated, interpreted, dissected and refuted is a whole history of arguments between philosophy, science and religion. They have also been used by the corrupt and the powerful to gain their perverse ends. Miracles have been derided and proved to be fraudulent and yet, for many, the miraculous maintain a grip on our imagination, our language and our belief to this day. With Martin Palmer, Director of the International Consultancy on Religion, Education and Culture;Janet Soskice, Reader in Philosophical Theology at Cambridge University; Justin Champion, Professor of the History of Early Modern Ideas at Royal Holloway, University of London.

Melvyn Bragg and guests discuss the Roman historian Tacitus who chronicled some of Rome’s most notorious emperors, including Nero and Caligula, and whose portrayal of Roman decadence influences the way we see Rome today. “The story I now commence is rich in vicissitudes, grim with warfare, torn by civil strife, a tale of horror even during times of peace”. So reads page one of The Histories by the Roman historian Tacitus and it doesn’t disappoint. Convinced that Rome was going to the dogs, Tacitus depicts a Rome which is a hotbed of sex and violence, of excessive wealth and senatorial corruption. His work is a pungent study in tyranny and decline that has influenced depictions of Rome, from Gibbon’s Decline and Fall to Robert Graves’ I, Claudius. But is it a true picture of the age or does Tacitus’ work present the tyranny and decadence of Rome at the expense of its virtues? And to what extent, when we look at the Roman Empire today, do we still see it through Tacitus' eyes?With Catharine Edwards, Professor of Classics and Ancient History at Birkbeck, University of London; Ellen O’Gorman, Senior Lecturer in Classics at the University of Bristol and Maria Wyke, Professor of Latin at University College London

Melvyn Bragg and guests discuss Dante’s ‘Inferno’ - a medieval journey through the nine circles of Hell. “Abandon hope, all ye who enter here”. This famous phrase is written above the gate of Hell in a 14th century poem by the Italian poet Dante Alighieri. The poem is called the ‘Divine Comedy’ and Hell is known as ‘Dante’s Inferno’. It is a lurid vision of the afterlife complete with severed heads, cruel and unusual punishments and devils in frozen lakes. But the inferno is much more than a trip into the macabre - it is a map of medieval spirituality, a treasure house of early renaissance learning, a portrait of 14th century Florence, and an acute study of human psychology. It is also one of the greatest poems ever written. With, Margaret Kean, University Lecturer in English and College Fellow at St Hilda’s College, University of Oxford; John Took, Professor of Dante Studies at University College London and Claire Honess, Senior Lecturer in Italian at the University of Leeds and Co-Director of the Leeds Centre for Dante Studies.

Melvyn Bragg and guests discuss the Arab conquests - an extraordinary period in the 7th and 8th centuries when the tribes of the Arabian Peninsula conquered the Middle East, Persia, North Africa and Southern Europe and spread the ideas of the Islamic religion. In 632 the prophet Muhammad died and left behind the nascent religion of Islam among a few tribes in the Arabian Desert. They were relatively small in number, they were divided among themselves and they were surrounded by vast and powerful empires. Yet within 100 years Arab armies controlled territory from Northern Spain to Southern Iran and Islamic ideas had begun to profoundly refashion the societies they touched. It is one of the most extraordinary and significant events in world history that began the slow and profound transformation of Greek and Persian societies into Islamic ones. But how did the Arab armies achieve such extensive victories, how did they govern the people they conquered and what was the relationship between the achievements of the Arabs and the religious beliefs they carried with them?With Hugh Kennedy, Professor of Arabic 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 and Robert Hoyland, Professor in Arabic and Middle East Studies at the University of St Andrews

Melvyn Bragg and guests discuss the music of the spheres, the elegant and poetic idea that the revolution of the planets generates a celestial harmony of profound and transcendent beauty. In Shakespeare’s The Merchant of Venice the young Lorenzo woos his sweetheart with talk of the stars: “There’s not the smallest orb which thou behold’stBut in his motion like an angel sings,Still quiring to the young-eyed cherubins;Such harmony is in immortal souls;But whilst this muddy vesture of decayDoth grossly close it in, we cannot hear it.”The idea of music of the spheres ran through late antiquity and the medieval period into the Renaissance and its echoes could be heard in astrology and astronomy, in theology, and, of course, in music itself. Influenced by Pythagoras and Plato, it was discussed by Cicero, Boethius, Marcello Ficino and Johannes Kepler It affords us a glimpse into minds for which the universe was full of meaning, of strange correspondences and grand harmonies.With Peter Forshaw, Postdoctoral Fellow at Birkbeck, University of London; Jim Bennett, Director of the Museum of the History of Science at the University of Oxford and Angela Voss, Director of the Cultural Study of Cosmology and Divination at the University of Kent, Canterbury.

Melvyn Bragg and guests discuss the Metaphysical poets, a diffuse group of 17th century writers including John Donne, Andrew Marvell and George Herbert. Mourning the death of a good friend in 1631, the poet Thomas Carew declared: “The Muses' garden, with pedantic weeds O'erspread, was purg'd by thee; the lazy seeds Of servile imitation thrown away, And fresh invention planted.”The gardener in question was a poet, John Donne, and from his fresh invention blossomed a group of 17th century writers called the metaphysical poets. Concerned with sex and death, with science and empire, the metaphysical poets challenged the conventions of Elizabethan poetry with drama and with wit. And they showed that English, like Italian and French, was capable of true poetry.Unashamedly modern, they were saluted by another great modernist, T.S. Eliot, who admired their genius for imagery, the freshness of their language and the drama of their poetic character. But what do we mean by metaphysical poetry, how did it reflect an age of drama and discovery and do poets as different as John Donne, Andrew Marvell and George Herbert really belong together in the canon of English literature? With Tom Healy, Professor of Renaissance Studies at Birkbeck College, University of London; Julie Sanders, Professor of English Literature and Drama at the University of Nottingham; and Tom Cain, Professor of Early Modern Literature at the University of Newcastle upon Tyne

Melvyn Bragg and guests discusses the prescient thriller ‘The Riddle of the Sands’ about the decline Anglo-German relations before the First World War. In 1903 an Englishman called Charles Caruthers went sailing in the North Sea and stumbled upon a German military plot. The cunning plan was to invade the British Isles from the Frisian Islands using special barges. The plucky Caruthers foiled the plot and returned to his sailing holiday.This is not history but fiction, an immensely popular book called ‘The Riddle of the Sands’ by Erskine Childers. It was a prescient vision of two nations soon to fight the First World War but it went against the spirit of the previous century. Brits and Germans had fought together at Waterloo and had influenced profoundly each other’s thought and art. They even shared a royal family. Yet somehow victory at Waterloo and the shared glories of Romanticism became the mutual tragedy of the Somme.With Richard Evans, Professor of Modern History at the University of Cambridge; Rosemary Ashton, Quain Professor of English Language and Literature at University College London and Tim Blanning, Professor of Modern European history at The University of Cambridge.

Melvyn Bragg and guests delve into the dark world of genetics under Joseph Stalin in discussing the career of Trofim Lysenko. In 1928, as America lurched towards the Wall Street Crash, Joseph Stalin revealed his master plan - nature was to be conquered by science, Russia to be made brutally, glitteringly modern and the world transformed by communist endeavour.Into the heart of this vision stepped Trofim Lysenko, a self-taught geneticist who promised to turn Russian wasteland into a grain-laden Garden of Eden. Today, Lysenko is a byword for fraud but in Stalin’s Russia his outlandish ideas about genetic inheritance and evolution became law. They reveal a world of science distorted by ideology, where ideas were literally a matter of life and death. To disagree with Lysenko risked the gulag and yet he destroyed Soviet Agriculture and damaged, perhaps irreparably, the Soviet Union’s capacity to fight and win the Cold War. With Robert Service, Professor of Russian History at the University of Oxford; Steve Jones, Professor of Genetics at University College London; Catherine Merridale, Professor of Contemporary History at Queen Mary, University of London.

Melvyn Bragg and guests discuss the strange mathematics of probability where heads or tails is a simple question with a far from simple answer. Gambling may be as old as the hills but probability as a mathematical discipline is a relative youngster. Probability is the field of maths relating to random events and, although commonplace now, the idea that you can pluck a piece of maths from the tumbling of dice, the shuffling of cards or the odds in the local lottery is a relatively recent and powerful one. It may start with the toss of a coin but probability reaches into every area of the modern world, from the analysis of society to the decay of an atom. With Marcus du Sautoy, Professor of Mathematics at the University of Oxford; Colva Roney-Dougal, Lecturer in Pure Mathematics at the University of St Andrews; Ian Stewart, Professor of Mathematics at the University of Warwick

Melvyn Bragg and guests discuss how the Black Death influenced the structure and ideas of Medieval Europe. In October 1347, a Genoese trading ship arrived at the busy port of Messina in Sicily and docked among many similar ships doing similar things. But this ship was special because this ship had rats and the rats had fleas and the fleas had plague. This was the Black Death and its terrible progress was captured by the Florentine writer Giovanni Boccaccio who declared “in those years a dead man was then of no more account than a dead goat”. In the long and unsanitary history of Europe there have been many plagues but only one Black Death. It killed over a third of Europe’s population in 4 years – young and old, rich and poor, in the town and in the country. When it stopped in 1351 it left a continent ravaged but transformed – the poor found their labour to be valuable, religion was both reinforced and undercut, medicine progressed, art changed and the continent awash with guilt and memorialisation. With Miri Rubin, Professor of Medieval and Early Modern History at Queen Mary, University of London; Samuel Cohn, Professor of Medieval History at the University of Glasgow; Paul Binski, Professor of the History of Medieval Art at Gonville and Caius College, University of Cambridge

Melvyn Bragg and guests discuss the Library at Nineveh, a treasure house of Assyrian ideas from the 7th Century BC. In 1849 a young English adventurer called Henry Layard started digging into a small hill on the banks of the River Tigris in Northern Iraq. Underneath it he found the ancient city of Nineveh. Layard unearthed extraordinary things - wonderful carved reliefs, ancient palace rooms and great statues of winged bulls. He also found a collection of clay tablets, broken up, jumbled around and sitting on the floor of a toilet. It was the remnants of a library and although Layard didn’t know it at the time, it was one of the greatest archaeological finds ever made.Conceived to house the sum of all human knowledge the library was built in the 7th century BC as the grand Assyrian Empire entered its last years. The clay tablets have proved to be a window into all aspects of Assyrian life, its literature, politics, religion and medicine – practises that are both deeply alien to us and alluringly familiar. With Eleanor Robson, Senior Lecturer at Cambridge University and Vice-Chair of the British Institute for the Study of Iraq; Karen Radner, Lecturer in the Ancient Near Eastern History at University College London; Andrew George, Professor of Babylonian at the School of Oriental and African Studies at the University of London

Melvyn Bragg and guests discuss the history of ideas about the human brain. Since time immemorial people have puzzled over the brain and its functions. In the 5th century BC the Greek physician Hippocrates confidently asserted:“Men ought to know that from the brain and from the brain only arise our pleasures, joys, laughter and jests, as well as our sorrows, pains, grieves and tears.” This might suggest that people have never doubted the importance of the brain, but for Aristotle the heart was the ruler of the body and the seat of the soul. Only in the 17th century, with new scientific advances, did the true importance of the brain begin to be appreciated. In 1669 the Danish anatomist, Nicolaus Steno, still lamented that, “the brain, the masterpiece of creation, is almost unknown to us.”How far have our perceptions of how the brain works and what it symbolises changed over the centuries? And, in amongst the matter or our little grey cells, are we still searching for our souls? With Vivian Nutton, Professor of the History of Medicine at University College London; Jonathan Sawday, Professor of English Studies at the University of Strathclyde; Marina Wallace, Professor at the University of the Arts, London, Central St Martin’s College of Art and Design

Melvyn Bragg and guests discuss the enclosure movement of the 18th and 19th centuries. In the early 19th century, the Northamptonshire poet John Clare took a good look at the countryside and didn’t like what he saw. He wrote: "Fence meeting fence in owners little boundsOf field and meadow, large as garden-grounds,In little parcels little minds to please,With men and flocks imprisoned, ill at ease."Enclosure means literally enclosing a field with a fence or a hedge to prevent others using it. This seemingly innocuous act triggered a revolution in land holding that dispossessed many, enriched a few but helped make the agricultural and industrial revolutions possible. It saw the dominance of private property as the model of ownership, as against the collective rights of previous generations. For some Enclosure underpinned the economic and agricultural development of Modern Britain. But it has also been a cause celebre for the political left ever since Karl Marx argued that enclosures created the industrialised working class and ushered in the capitalist society. What really happened during the era of 18th and 19th century enclosures? Who gained, who lost and what role did Enclosures play in the agricultural and industrial transformation of this country? With Rosemary Sweet, Director of the Centre for Urban History at the University of Leicester; Murray Pittock, Bradley Professor of English Literature at the University of Glasgow; Mark Overton, Professor of Economic and Social History at the University of Exeter.

Melvyn Bragg and guests discuss Materialism in Philosophy – the idea that matter and the interactions between matter account for all that exists and all that happens. We trace the descent of materialism from the ancient Greek philosophers Democritus and Epicurus, to its powerful and controversial flowering in the 17th, 18th and 19th centuries as an attack on religion. It’s provocative stuff even today and certainly was in 1770 when Baron D’Holbach published his book The System of Nature. He wrote: "If we go back to the beginning we shall find that ignorance and fear created the gods; that fancy, enthusiasm, or deceit adorned or disfigured them; that weakness worships them; that credulity preserves them, and that custom, respect and tyranny support them."Materialism was considered so dangerous that every copy of the Baron’s book was condemned to be burnt. Despite this, or perhaps because of it, materialism dominates much of our understanding of the world today. Associated with science and atheism, Materialism has influenced many forms of contemporary human thought from the process of history to the diagnosis of disease and boasts a cast list of devotees including Pierre Gassandi, Thomas Hobbes, the Marquis de Sade and Karl Marx. But what does materialism really mean, how has it developed over time and can we still have free will if we are living in a materialist world? With Anthony Grayling, Professor of Philosophy at Birkbeck College, University of London; Caroline Warman, Fellow of Jesus College, Oxford; Anthony O’Hear, Professor of Philosophy at the University of Buckingham

Melvyn Bragg and guests discuss the poet W.B. Yeats and Irish politics. Yeats lived through a period of great change in Ireland from the collapse of the home rule bill through to the Easter Rising of 1916 and the partitioning of the country. In May 1916, 15 men were shot by the British government. They were the leaders of the Easter Rising – a doomed attempt to overthrow British rule in Ireland - and they were commemorated by W.B. Yeats in a poem called Easter 1916. It ends with the following lines: MacDonagh and MacBrideAnd Connolly and PearseNow and in time to be,Wherever green is worn,Are changed, changed utterly:A terrible beauty is born.Yeats lived through decades of turbulence in Ireland. He saw the suspension of home rule, civil war and the division of the country, but how did the politics of the age imprint themselves on his poetry, what was the nature of Yeats’ own nationalism, and what did he mean by that most famous of phrases ‘a terrible beauty is born’?With Roy Foster, Carroll Professor of Irish History at Oxford University and Fellow of Hertford College, Oxford; Fran Brearton, Reader in English at Queen’s University, Belfast and Assistant Director of the Seamus Heaney Centre for Poetry; Warwick Gould, Director of the Institute of English Studies in the School of Advanced Study, University of London

Melvyn Bragg and guests discuss ‘the Norman Yoke’ – the idea that the Battle of Hastings sparked years of cruel oppression for the Anglo Saxons by a Norman ruling class. ‘Norman saw on English oak,On English neck a Norman yoke;Norman spoon in English dish,And England ruled as Normans wish.’Taken from Sir Walter Scott’s novel ‘Ivanhoe’, these words encapsulate the idea of ‘the Norman Yoke’ – that the Battle of Hastings sparked the cruel oppression of Anglo-Saxon liberties by a foreign ruling class. Certainly, William the Conqueror proclaimed his power in great castles and cathedrals, turned the church upside down and even changed the colour of scribal ink. But was it really such a terrible time for the Anglo Saxons or was the idea of beastly Norman oppressors and noble Saxon sufferers invented later to shore up the idea of Englishness? With Sarah Foot, Regius Professor of Ecclesiastical History at Christ Church, Oxford; Richard Gameson, Professor in the Department of History at Durham University; Matthew Strickland, Professor of Medieval History at the University of Glasgow.

Melvyn Bragg and guests discuss Newton’s Laws of Motion. In 1687 Isaac Newton attempted to explain the movements of everything in the universe, from a pea rolling on a plate to the position of the planets. It was a brilliant, vaultingly ambitious and fiendishly complex task; it took him three sentences. These are the three laws of motion with which Newton founded the discipline of classical mechanics and conjoined a series of concepts - inertia, acceleration, force, momentum and mass - by which we still describe the movement of things today. Newton’s laws have been refined over the years – most famously by Einstein - but they were still good enough, 282 years after they were published, to put Neil Armstrong on the Moon. With Simon Schaffer, Professor in History and Philosophy of Science at the University of Cambridge and Fellow of Darwin College; Raymond Flood, University Lecturer in Computing Studies and Mathematics and Senior Tutor at Kellogg College, University of Oxford; Rob Iliffe, Professor of Intellectual History and History of Science at the University of Sussex.

Melvyn Bragg and guests discuss Henry VIII and the Dissolution of the Monasteries. Was Henry’s decision to destroy monastic culture in this country a tyrannical act of grand larceny or the pious destruction of a corrupt institution? When he was an old man, Michael Sherbrook remembered the momentous events of his youth: “All things of price were either spoiled, plucked away or defaced to the uttermost…it seemed that every person bent himself to filch and spoil what he could. Nothing was spared but the ox-houses and swincotes…” He was talking about the destruction of Roche Abbey, but it could have been Lewes or Fountains, Glastonbury, Tintern or Walsingham, names that haunt the religious past as their ruins haunt the landscape. These were the monasteries, suddenly and for many shockingly, destroyed during the reign of Henry VIII.The conflict was played out with a mix of violence, heroism, political manoeuvring and genuine theological disputation. But what was lost in terms of architecture, painting, treasure and in the religious habits of the monasteries themselves and of the common people who lived with them?With Diarmaid MacCulloch, Professor of the History of the Church at Oxford University; Diane Purkiss, Fellow and Tutor at Keble College, Oxford; George Bernard, Professor of Early Modern History at the University of Southampton

Melvyn Bragg and guests discuss the rich and radical ideas of Soren Kierkegaard, often called the father of Existentialism.In 1840 a young Danish girl called Regine Olsen got engaged to her sweetheart – a modish and clever young man called Søren Kierkegaard. The two were deeply in love but soon the husband to be began to have doubts. He worried that he couldn’t make Regine happy and stay true to himself and his dreams of philosophy. It was a terrible dilemma, but Kierkegaard broke off the engagement – a decision from which neither he nor his fiancée fully recovered. This unhappy episode has become emblematic of the life and thought of Søren Kierkegaard - a philosopher who confronted the painful choices in life and who understood the darker modes of human existence. Yet Kierkegaard is much more than the gloomy Dane of reputation. A thinker of wit and elegance, his ability to live with paradox and his desire to think about individuals as free have given him great purchase in the modern world and he is known as the father of Existentialism.With Jonathan Rée, Visiting Professor at Roehampton University and the Royal College of Art; Clare Carlisle, Lecturer in Philosophy at the University of Liverpool; John Lippitt, Professor of Ethics and Philosophy of Religion at the University of Hertfordshire.

Melvyn Bragg and guests discuss the Greek myths from Achilles to Zeus. Are you a touch narcissistic? Do you have the body of an Adonis? Are you willing to undertake Herculean tasks or Promethean ventures? Perhaps you have an Oedipus complex? If you answer to any or perhaps all of these you owe something to the Greek myths, a collection of weird and wonderful stories that, like Penelope’s shroud or the needlework of Arachne, were constantly woven and unpicked across centuries of Greek and Roman civilisation. The myths have a cast of thousands including mighty Zeus, Jason and the Argonauts, wily Odysseus, beautiful Aphrodite and Cerberus, the three-headed dog. They are funny, shocking, quirky and epic and have retained their power and their wisdom from the ancient world to the modern. With Nick Lowe, Senior Lecturer in Classics at Royal Holloway, University of London; Richard Buxton, Professor of Greek Language and Literature at the University of Bristol; Mary Beard, Professor of Classics at Cambridge University

Melvyn Bragg and guests discuss the 19th century mathematician Ada Lovelace. Deep in the heart of the Pentagon is a network of computers. They control the US military, the most powerful army on the planet, but they are controlled by a programming language called Ada. It’s named after Ada Lovelace, the allegedly hard drinking 19th century mathematician and daughter of Lord Byron. In her work with Charles Babbage on a steam driven calculating machine called the Difference Engine, Ada understood, perhaps before anyone else, what a computer might truly be. As such the Difference Engine is the spiritual ancestor of the modern computer.Ada Lovelace has been called many things - the first computer programmer and a prophet of the computer age – but most poetically perhaps by Babbage himself as an ‘enchantress of numbers’.With Patricia Fara, Senior Tutor at Clare College, Cambridge; Doron Swade, Visiting Professor in the History of Computing at Portsmouth University; John Fuegi, Visiting Professor in Biography at Kingston University.

Melvyn Bragg and guests discuss King Lear. Around the turn of 1606, a group of London theatre-goers braved the plague to take in a new play by the well-known impresario, Mr William Shakespeare. Packed into the Globe Theatre, they were treated to a tale of violence, hatred and betrayal so upsetting that it thereafter languished among Shakespeare’s less popular plays.The story of Lear – of a man who divides up his property and loses the love of a daughter - is an ancient and ultimately happy one. But in the hands of William Shakespeare it became a shocking and violent vision of a broken family in a godless universe. So shocking that after the playwright’s death it was shunned and rewritten with a happy ending. Only in the 19th and 20th centuries did Shakespeare’s bleak, experimental and disorientating drama attain the status it has now. But why did Shakespeare take a story from the deep history of Britain and make it so shockingly his own and when, from the Civil War to the Second World War, did this powerful and confusing tragedy emerge as Shakespeare’s greatest? With Jonathan Bate, Professor of English Literature at the University of Warwick; Katherine Duncan-Jones, Tutorial Fellow in English at Somerville College, Oxford; Catherine Belsey, Research Professor in English at the University of Wales, Swansea

Melvyn Bragg and guests will be leaving the studio, the planet and indeed, the universe to take a tour of the Multiverse. If you look up the word ‘universe’ in the Oxford English Dictionary you will find the following definition: “The whole of created or existing things regarded collectively; all things (including the earth, the heavens, and all the phenomena of space) considered as constituting a systematic whole.” That sounds fairly comprehensive as a description of everything, but for an increasing number of physicists and cosmologists the universe is not enough. They talk of a multiverse – literally many universes – to explain aspects of their theory, the character of the universe and the riddle of our existence within it. Indeed, compared to the scope and complexity of the multiverse, the whole of our known reality may be as a speck of sand upon a beach.The idea of a multiverse is still controversial, some argue that it isn’t even science, because it is based on an idea that we may never be able to prove or even see. But what might a multiverse be like, why are physicists and cosmologists increasingly interested in it and is it really scientific to discuss the existence of universes we may never know anything With Martin Rees, President of the Royal Society and Professor of Cosmology and Astrophysics at the University of Cambridge; Fay Dowker, Reader in Theoretical Physics at Imperial College; Bernard Carr, Professor of Mathematics and Astronomy at Queen Mary, University of London

Melvyn Bragg and guests discuss the Statue of Liberty."Give me your tired, your poor, your huddled masses yearning to breathe free”. With these words, inscribed inside her pedestal, the Statue of Liberty has welcomed immigrants to America since 1903. But the Statue of Liberty is herself an immigrant, born in Paris she was shipped across the Atlantic in 214 separate crates, a present to the Americans from the French. She is a token of friendship forged in the fire of twin revolutions, finessed by thinkers like Alexis de Tocqueville and expressed in the shared language of liberty. But why was this colossal statue built, who built it and what did liberty mean to the Frenchmen who created her and the Americans who received her?With Robert Gildea, Professor of Modern History at Oxford University; Kathleen Burk, Professor of Modern Contemporary History at University College London; John Keane, Professor of Politics at the University of Westminster

Melvyn Bragg and guests discuss the Social Contract and ask a foundational question of political philosophy – by what authority does a government govern? “Man was born free and he is everywhere in chains”. So begins Jean Jacques Rousseau’s great work on the Social Contract. Rousseau was trying to understand why a man would give up his natural freedoms and bind himself to the rule of a prince or a government. But the idea of the social contract - that political authority is held through a contract with those to be ruled - began before Rousseau with the work of John Locke, Hugo Grotius and even Plato. We explore how an idea that burgeoned among the 17th century upheavals of the English civil war and then withered in the face of modern capitalist society still influences our attitude to government today. With Melissa Lane, Senior University Lecturer in History at Cambridge University; Susan James, Professor of Philosophy at Birkbeck College, University of London; Karen O’Brien, Professor of English Literature at the University of Warwick.

Melvyn Bragg and guests discuss the coterie of brilliant thinkers gathered in 16th century Prague by the melancholic emperor Rudolph II. In 1606 the Archdukes of Vienna declared: “His majesty is interested only in wizards, alchemists, Kabbalists and the like, sparing no expense to find all kinds of treasures, learn secrets and use scandalous ways of harming his enemies…He also has a whole library of magic books. He strives all the time to eliminate God completely so that he may in future serve a different master.”The subject of this coruscating attack was the Holy Roman Emperor, Rudolf II, and his court at Prague. Rudolph had turned Prague into a collector’s cabinet for the wonders and curiosities of the age – the great paintings of Northern Italy were carried to him over the Alps, intricate automatons constructed to serve drinks, maps and models of the heavens were unwound and engineered as the magnificent city of Prague itself was rebuilt in the image of its dark and thoughtful patron in chief. But Rudolf’s greatest possessions were people - the astronomers Johannes Kepler and Tycho Brahe, the magus John Dee and the philosopher Giordano Bruno had all found their way to his city. Far from the devilish inquisitor of the archdukes’ imaginations, Rudolf patronised a powerhouse of Renaissance ideas. With Peter Forshaw, Postdoctoral Fellow at Birkbeck, University of London and an Honorary Fellow of the University of Exeter; Howard Hotson, Lecturer in Modern History at the University of Oxford; Adam Mosley, Lecturer in the Department of History at the University of Wales, Swansea.

Melvyn Bragg and guests discuss how the science of plate tectonics revolutionised our understanding of the planet on which we live. America is getting further away from Europe. This is not a political statement but a geological fact. Just as the Pacific is getting smaller, the Red Sea bigger, the Himalayas are still going up and one day the Horn of Africa will be a large island. This is the theory of plate tectonics, a revolutionary idea in 20th century geology that claimed the continents of Earth were dancing to the music of deep time. A dance of incredible slowness, yet powerful enough to throw up the mountains and pour away the oceans.Plate tectonics, the idea that the earth’s surface moved on a carpet of molten magma, constituted a genuine scientific revolution in geology. It explained why mountains appeared and why earth quakes occurred; it explained the curious distribution of fossils across the globe and finally solved the age old conundrum of why continents such as Africa and South America appeared to fit together like a giant jigsaw puzzle. Plate tectonics has made geologists, and many more besides, profoundly re-think what the Earth was, how it worked and how it related to all the things in it. With Richard Corfield, Visiting Senior Lecturer in Earth Sciences at the Open University; Joe Cann, Senior Fellow in the School of Earth and Environment at the University of Leeds; Lynne Frostick, Director of the Hull Environment Research Institute and Professor of Physical Geography at the University of Hull

Melvyn Bragg and guests will be delving into the world of medieval legend in pursuit of the powerful and enigmatic Fisher King. In the world of medieval romance there are many weird and wonderful creatures – there are golden dragons and green knights, sinister enchantresses and tragic kings, strange magicians and spears that bleed and talk. And yet, in all this panoply of wonder, few figures are more mysterious than the Fisher King.Blighted by a wound that will not heal and entrusted as the keeper of the Holy; the Fisher King is also a version of Christ, a symbol of sexual anxiety and a metaphor for the decay of societies and civilisations. The Fisher King is a complex and poetic figure and has meant many things to many people. From the age of chivalry to that of psychoanalysis, his mythic even archetypal power has influenced writers from Chrétien de Troyes in the 12th century to TS Eliot in the 20th. With Carolyne Larrington, Tutor in Medieval English at St John’s College, Oxford; Stephen Knight, Distinguished Research Professor in English Literature at Cardiff University; Juliette Wood, Associate Lecturer in the Department of Welsh, Cardiff University and Director of the Folklore Society

Melvyn Bragg and guests discuss the Charge of the Light - an event of no military significance that has become iconic in the British historical imagination. On November 14th 1854 The Times newspaper reported on a minor cavalry skirmish in the Crimean War: “They swept proudly past, glittering in the morning sun in all the pride and splendour of war... At the distance of 1200 yards the whole line of the enemy belched forth, from thirty iron mouths, a flood of smoke and flame through which hissed the deadly balls. Their flight was marked by instant gaps in our ranks, by dead men and horses, by steeds flying wounded or riderless across the plain”.This is the debacle of the Charge of the Light Brigade, which made little difference to the Crimean War yet has become deeply embedded in British culture. It helped to provoke the resignation of a Prime Minister and it profoundly changed British attitudes to war and to the soldiers who fought in them. It also brought censorship to bear on previously uncensored war reporting and inspired Alfred, Lord Tennyson to sit down and write “All in the Valley of Death rode the six hundred”.With Mike Broers, Lecturer in Modern History at the University of Oxford and a Fellow of Lady Margaret Hall; Trudi Tate, Fellow of Clare Hall, Cambridge; Saul David, Visiting Professor of Military History at the University of Hull

Melvyn Bragg and guests discuss the Algerian-French writer and Existentialist philosopher Albert Camus. Shortly after the new year of 1960, a powerful sports car crashed in the French town of Villeblevin in Burgundy, killing two of its occupants. One was the publisher Michel Gallimard; the other was the writer Albert Camus. In Camus’ pocket was an unused train ticket and in the boot of the car his unfinished autobiography The First Man. Camus was 46. Born in Algeria in 1913, Camus became a working class hero and icon of the French Resistance. His friendship with Sartre has been well documented, as has their falling out; and although Camus has been dubbed both an Absurdist and Existentialist philosopher, he denied he was even a philosopher at all, preferring to think of himself as a writer who expressed the realities of human existence. Awarded the Nobel Prize for Literature in 1957, Camus’ legacy is a rich one, as an author of plays, novels and essays, and as a political thinker who desperately sought a peaceful solution to the War for Independence in his native Algeria. With Peter Dunwoodie, Professor of French Literature at Goldsmiths, University of London; David Walker, Professor of French at the University of Sheffield; Christina Howells, Professor of French at Wadham College, University of Oxford.

Melvyn Bragg and guests discuss the Nicene Creed which established the Divinity of Christ. "We believe in one God, the Father Almighty, Maker of heaven and earth, and of all things visible and invisible. And in one Lord Jesus Christ, the only-begotten Son of God, begotten of the Father before all worlds." Thus begins the Nicene Creed, a statement of essential faith spoken for over 1600 years in Christian Churches - Catholic, Orthodox and Protestant. But what has become a universal statement was written for a very particular purpose - to defeat a 4th century theological heresy called Arianism and to establish that Jesus Christ was, indeed, God. The story of the Creed is in many ways the story of early Christianity – of delicate theology and robust politics. It changed the Church and it changed the Roman Empire, but that it has lasted for nearly 2000 years would seem extraordinary to those who created it. With Martin Palmer, Director of the International Consultancy on Religion, Education and Culture; Caroline Humfress, Reader in History at Birkbeck College, University of London; Andrew Louth, Professor of Patristic and Byzantine Studies at the University of Durham.

Melvyn Bragg and guests talk about blood, black bile, yellow bile and phlegm. These are the four humours, a theory of disease and health that is among the most influential ideas aver conceived. According to an 11th century Arabic book called the Almanac of Health, an old man went to the doctor complaining of a frigid complexion and stiffness in winter. The doctor, after examining his condition, prescribed a rooster. Being a hot and dry bird it was the perfect tonic for a cold and rheumatic old man. This is medicine by the four humours. The idea that the body is a concoction of these four essential juices is one of the oldest on record. From the Ancient Greeks to the 19th century it explained disease, psychology, habit and personality. When we describe people as being choleric, sanguine or melancholic we are still using the language of the humours today. It also explains why, in the long and convoluted history of medical practice, pigeon livers were an aphrodisiac, blood letting was a form of heroism (and best done in spring) and why you really could be frightened to death. The theory was dismantled from the 17th century but in its belief that the mind and body are intimately connected and that health requires equilibrium the humours retain an influence to this dayWith David Wootton, Anniversary Professor of History at the University of York; Vivian Nutton, Professor of the History of Medicine at University College London; Noga Arikha, Visiting Fellow at the Institut Jean-Nicod in Paris

Melvyn Bragg and guests discuss the Sassanian Empire. Founded around 226 AD, in Persia, the Sassanian Empire lasted over 400 years as a grand imperial rival to Rome. In modern day Iran, just down the road from the ancient Persian capital of Persepolis, there is a picture carved into a rock. It depicts a king, triumphant on horseback, facing two defeated enemies. This is no pair of petty princes, they are Roman Emperors - Philip and Valerian - and the king towering above them is Shapur I of the Sassanian Empire. So complete was his victory that Shapur is reputed to have used Valerian as a footstool when mounting his horse. This super-power traded goods from Constantinople to Beijing, handed regular defeats to the Roman army and only fell to the Islamic conquests of the 7th century. It still influences Persian identity to this day. But what was the culture and the literature of the empire, its structure and organisation? And what was its role in the great geopolitical game played out between the decaying empires in late antiquity?With Hugh Kennedy, Professor of Arabic in the Faculty of Languages and Cultures at the School of Oriental and African Studies; Vesta Sarkhosh Curtis, Curator of Iranian and Islamic Coins in the British Museum; James Howard-Johnston, University Lecturer in Byzantine Studies at the University of Oxford.

Melvyn Bragg and guests discuss mutation in genetics and evolution. When lying mortally ill with cancer, the British geneticist J.B.S. Haldane penned the following lines: Cancer's a Funny Thing:I wish I had the voice of HomerTo sing of rectal carcinoma,Which kills a lot more chaps, in fact,Than were bumped off when Troy was sacked...Haldane knew better than most that many cancers, and many other diseases, are caused by genetic mutation. A mutation is an error in reproduction between one generation and the next as the copying mechanism that allows you to inherit your parent’s genes goes awry. Mutations are almost always bad news for the organism that suffers them and yet mutation is also a giver of life. Without it there would be no natural selection, no evolution and, arguably, no life on this planet. It’s not unreasonable to see life itself as a mutation and to understand this may also hold the key to aging and disease. It is, in the Darwinian view of life, the raw material of evolution.With Steve Jones, Professor of Genetics in the Galton Laboratory, University College London; Adrian Woolfson, lectures in Medicine at Cambridge University; Linda Partridge, Weldon Professor of Biometry at University College LondonTags

Melvyn Bragg and guests discuss the Fibonacci Sequence. Named after a 13th century Italian Mathematician, Leonardo of Pisa who was known as Fibonacci, each number in the sequence is created by adding the previous two together. It starts 1 1 2 3 5 8 13 21 and goes on forever. It may sound like a piece of mathematical arcania but in the 19th century it began to crop up time and again among the structures of the natural world, from the spirals on a pinecone to the petals on a sunflower.The Fibonacci sequence is also the mathematical first cousin of the Golden Ratio – a number that has haunted human culture for thousands of years. For some, the Golden ratio is the essence of beauty found in the proportions of the Parthenon and the paintings of Leonardo Da Vinci. With Marcus du Sautoy, Professor of Mathematics at the University of Oxford; Jackie Stedall, Junior Research Fellow in History of Mathematics at Queen’s College, Oxford; Ron Knott, Visiting Fellow in the Department of Mathematics at the University of Surrey

Melvyn Bragg and guests discuss one of the greatest long poems in the English language – The Prelude. Begun in Northern Germany during the terrible winter of 1798 by a young and dreadfully homesick William Wordsworth, The Prelude was to be his masterpiece - an epic retelling of his own life and the foundation stone of English Romanticism. In language of aching beauty wordsworth expressed thoughts about memory, identity, nature and experience familiar to anybody who has walked alone among the hills. With Rosemary Ashton, Quain Professor of English Language and Literature at University College London; Stephen Gill, University Professor of English Literature and Fellow of Lincoln College, Oxford; Emma Mason, Senior Lecturer in English at the University of Warwick.

Melvyn Bragg discusses the discovery of Oxygen by Joseph Priestley and Antoine Lavoisier. In the late 18th century Chemistry was the prince of the sciences – vital to the economy, it shaped how Europeans fought each other, ate with each other, what they built and the medicine they took. And then, in 1772, the British chemist, Joseph Priestley, stood in front of the Royal Society and reported on his latest discovery: “this air is of exalted nature…A candle burned in this air with an amazing strength of flame; and a bit of red hot wood crackled and burned with a prodigious rapidity. But to complete the proof of the superior quality of this air, I introduced a mouse into it; and in a quantity in which, had it been common air, it would have died in about a quarter of an hour; it lived at two different times, a whole hour, and was taken out quite vigorous.” For the British dissenting preacher, Joseph Priestley, and the French aristocrat, Antoine Lavoisier, Chemistry was full of possibilities and they pursued them for scientific and political ends. But they came to blows over oxygen because they both claimed to have discovered it, provoking a scientific controversy that rattled through the laboratories of France and England until well after their deaths. To understand their disagreement is to understand something about the nature of scientific discovery itself. With Simon Schaffer, Professor in History and Philosophy of Science at the University of Cambridge; Jenny Uglow, Honorary Visiting Professor at the University of Warwick; Hasok Chang, Reader in Philosophy of Science at University College London.

Melvyn Bragg and guests discuss the Persian Islamic philosopher, Avicenna. In the city of Hamadan in Iran, right in the centre, there is a vast mausoleum dedicated to an Iranian national hero. Built in 1952, exactly 915 years after his death, it’s a great conical tower with twelve supporting columns. It’s dedicated not to a warrior or a king but to a philosopher and physician. His name is Ali Al Husayn Ibn-Sina, but he is also known as Avicenna and he is arguably the most important philosopher in the history of Islam. In a colourful career Avicenna proved the existence of god, amalgamated all known medical knowledge into one big book and established a mind body dualism 600 years before Descartes and still found time to overindulge in wine and sex. With Peter Adamson, Reader in Philosophy at King's College London; Amira Bennison, Senior Lecturer in Middle Eastern and Islamic Studies at the University of Cambridge; Nader El-Bizri, Affiliated Lecturer in the History and Philosophy of Science at the University of Cambridge.

Melvyn Bragg and guests discuss morality by taking a long hard look at the idea of guilt. The 18th century politician and philosopher Edmund Burke was once moved to comment: “Guilt was never a rational thing; it distorts all the faculties of the human mind, it perverts them, it leaves a man no longer in the free use of his reason, it puts him into confusion.”Guilt is a legal category but also a psychological state and a moral idea. Over the centuries theologians, philosophers and psychologists have tried to determine how it relates to morality, reason and the workings of the mind? The answers seem to cut deeply into our understanding of what it is to be human.With Stephen Mulhall, Fellow and Tutor in Philosophy at New College, Oxford; Miranda Fricker, Senior Lecturer in Philosophy at Birkbeck, University of London; Oliver Davies, Professor of Christian Doctrine at King’s College London

Melvyn Bragg and guests discuss the 18th century obsession with taste. In the mid 18th century the social commentator, George Coleman, decried the great fashion of his time: “Taste is at present the darling idol of the polite world…The fine ladies and gentlemen dress with Taste; the architects, whether Gothic or Chinese, build with Taste; the painters paint with Taste; critics read with Taste; and in short, fiddlers, players, singers, dancers, and mechanics themselves, are all the sons and daughters of Taste. Yet in this amazing super-abundancy of Taste, few can say what it really is, or what the word itself signifies.”From the pens of philosophers to the interior decor of the middle classes, the idea of good and bad taste shaped decisions about dress, wallpaper, furniture, architecture, literature and much more. The period saw an explosion in the taste industries - the origins of Chippendale furniture, Wedgwood pottery and Christie's auction house - and a similar growth in magazines and journals devoted to the new aesthetic, moral and social guidelines. But taste was also a battle ground that pitched old money against new, the city against the country and men against women. With Amanda Vickery, Reader in History at Royal Holloway, University of London; John Mullan, Professor of English at University College London; Jeremy Black, Professor of History at the University of Exeter

Melvyn Bragg discusses the myths, tales and legends of the Arabian Nights.Once upon a time a wealthy merchant grew hot in the sun and sat down under a tree. Having eaten a date, he threw aside the stone, and immediately there appeared before him a Genie of enormous height who, holding a drawn sword in his hand, approached him, and said, “rise that I may kill thee”. This is from The Arabian Nights, a collection of miraculous tales including Ali Baba and the Forty Thieves and Sinbad the Sailor. Forged in the medieval Arab world, it became so popular in Europe that the 18th century Gothic writer Horace Walpole declared “Read Sinbad the Sailor’s Voyages and you will grow sick of Aeneas”.Its origins are Indian and Persian but it was championed initially by an 18th century Frenchman, Antoine Galland. Celebrated for its fabulous stories, it is a patchwork of sex, violence, magic, adventure, and cruelty – a far cry from the children’s book that it has become. With Robert Irwin, Senior Research Associate at the School of Oriental and African Studies, University of London; Marina Warner, Professor in the Department of Literature, Film and Theatre Studies at the University of Essex; Gerard van Gelder, Laudian Professor of Arabic at the University of Oxford.

Melvyn Bragg and guests discuss the Divine Right of Kings. In Shakespeare’s Macbeth, the character Malcolm describes the magical healing powers of the king: “How he solicits heaven, Himself best knows; but strangely-visited people, All swoln and ulcerous, pitiful to the eye, The mere despair of surgery, he cures; Hanging a golden stamp about their necks, Put on with holy prayers...”The idea that a monarch could heal with his touch flowed from the idea that a king was sacred, appointed by God and above the judgement of earthly powers. It was called the Divine Right of Kings. The idea resided deep in the culture of 17th century Britain affecting the pomp of the Stuart Kings, the writings of Milton and Shakespeare and the political works of John Locke. It is a story that involves witches, regicide, scrofula, Macbeth, miraculous portraits and some of the greatest poetry in the English language. With Justin Champion, Professor of the History of Early Modern Ideas at Royal Holloway, University of London; Tom Healy, Professor of Renaissance Studies at Birkbeck College, University of London; Clare Jackson, Lecturer and Director of Studies in History at Trinity Hall, Cambridge

Melvyn Bragg and guests discuss Antimatter, a type of particle predicted by the British physicist, Paul Dirac. Dirac once declared that “The laws of nature should be expressed in beautiful equations”. True to his word, he is responsible for one of the most beautiful. Formulated in 1928, it describes the behaviour of electrons and is called the Dirac equation. But the Dirac equation is strange. For every question it gives two answers – one positive and one negative. From this its author concluded that for every electron there is an equal and opposite twin. He called this twin the anti-electron and so the concept of antimatter was born.Despite its popularity with Science Fiction writers, antimatter is relatively mundane in physics – we have created antimatter in the laboratory and we even use it in our hospitals. But one fundamental question remains – why isn’t there more antimatter in the universe. Answering that question will involve developing new physics and may take us closer to understanding events at the origin of the universe. With Val Gibson, Reader in High Energy Physics at the University of Cambridge; Frank Close, Professor of Physics at Exeter College, University of Oxford; Ruth Gregory, Professor of Mathematics and Physics at the University of Durham

Melvyn Bragg and guests discuss the Greek philosopher Socrates, acknowledged as one of the founders of Western philosophy. Born in 469 BC into the golden age of the city of Athens, he has profoundly influenced philosophy ever since. In fact, his impact is so profound that all the thinkers who went before are simply known as pre-Socratic.In person Socrates was deliberately irritating, he was funny and he was rude; he didn’t like democracy very much and spent quite a lot of time in shoe shops. He claimed he was on a mission from God to educate his fellow Athenians but has left us nothing in his own hand because he refused to write anything down. With Angie Hobbs, Associate Professor of Philosophy at Warwick University; David Sedley, Laurence Professor of Ancient Philosophy at Cambridge University; Paul Millett, Senior Lecturer in Classics at the University of Cambridge.

Melvyn Bragg and guests discuss the literary sensation caused by Gustave Flaubert's novel Madame Bovary. In January 1857 a man called Ernest Pinard stood up in a crowded courtroom and declared, “Art that observes no rule is no longer art; it is like a woman who disrobes completely. To impose the one rule of public decency on art is not to subjugate it but to honour it”. Pinard was no grumbling hack, he was the imperial prosecutor of France, and facing him across the courtroom was the writer Gustave Flaubert. Flaubert’s work had been declared “an affront to decent comportment and religious morality”. It was a novel called Madame Bovary.The story of an adulterous housewife called Emma, Madame Bovary, is a vital staging post in the development of realism. The arguments in court involved a heady brew of art, morality, sex and marriage and ensured the fame of the novel and its author. With Andy Martin, Lecturer in French at the University of Cambridge; Mary Orr, Professor of French at the University of Southampton; Robert Gildea, Professor of Modern History at the University of Oxford

Melvyn Bragg and guests discuss the Pilgrim Fathers and their 1620 voyage to the New World on the Mayflower. Every year on the fourth Thursday in November, Americans go home to their families and sit down to a meal. It’s called Thanksgiving and it echoes a meal that took place nearly 400 years ago, when a group of religious exiles from Lincolnshire sat down, after a brutal winter, to celebrate their first harvest in the New World. They celebrated it in company with the American Indians who had helped them to survive.These settlers are called the Pilgrim Fathers. They were not the first and certainly not the largest of the early settlements but their Plymouth colony has retained a hold on the American imagination which the larger, older, violent and money-driven settlement of Jamestown has not.With Kathleen Burk, Professor of Modern and Contemporary History at University College London; Harry Bennett, Reader in History and Head of Humanities at the University of Plymouth; Tim Lockley, Associate Professor of History at the University of Warwick

Melvyn Bragg and guests discuss the Permian-Triassic boundary. 250 million years ago, in the Permian period of geological time, the most ferocious predators on earth were the Gorgonopsians. Up to ten feet in length, they had dog-like heads and huge sabre-like teeth. Mammals in appearance, their eyes were set in the side of their heads like reptiles. They looked like a cross between a lion and giant monitor lizard and were so ugly that they are named after the gorgons from Greek mythology – creatures that turned everything that saw them to stone. Fortunately, you’ll never meet a gorgonopsian or any of their descendants because they went extinct at the end of the Permian period. And they weren’t alone. Up to 95% of all life died with them. It’s the greatest mass extinction the world has ever known and it marks what is called the Permian-Triassic boundary. But what caused this catastrophic juncture in life, what evidence do we have for what happened and what do events like this tell us about the pattern and process of evolution itself?With Richard Corfield, Senior Lecturer in Earth Sciences at the Open University; Mike Benton, Professor of Vertebrate Palaeontology in the Department of Earth Sciences at the University of Bristol; Jane Francis, Professor of Palaeoclimatology at the University of Leeds

Melvyn Bragg looks at an unexpected philosophical subject - the philosophy of common sense. In the first century BC the Roman statesman Marcus Tullius Cicero claimed “There is no statement so absurd that no philosopher will make it”. Indeed, in the history of Western thought, philosophers have rarely been credited with having much common sense. In the 17th century Francis Bacon made a similar point when he wrote “Philosophers make imaginary laws for imaginary commonwealths, and their discourses are as the stars, which give little light because they are so high”. Samuel Johnson picked up the theme with characteristic pugnacity in 1751 declaring that “the public would suffer less present inconvenience from the banishment of philosophers than from the extinction of any common trade.” Philosophers, it seems, are as distinct from the common man as philosophy is from common sense.But as Samuel Johnson scribbled his pithy knockdown in the Rambler magazine, the greatest philosophers in Britain were locked in a dispute about the very thing he denied them: Common Sense. It was a dispute about the nature of knowledge and the individuality of man, from which we derive the idea of common sense today. The chief antagonists were a minister of the Scottish Church, Thomas Reid, and the bon-viveur darling of the Edinburg chattering classes, David Hume. It's a journey that also takes in Rene Descartes, Immanuel Kant, John Locke and some of the most profound questions about human knowledge we are capable of asking.With A C Grayling, Professor of Philosophy at Birkbeck, University of London; Melissa Lane, Senior University Lecturer in History at Cambridge University; Alexander Broadie, Professor of Logic and Rhetoric at the University of Glasgow.