In Our Time

Melvyn Bragg and guests discuss the life and ideas of Wolfgang Pauli (1900-1958), whose Exclusion Principle is one of the key ideas in quantum mechanics. A brilliant physicist, at 21 Pauli wrote a review of Einstein's theory of general relativity and that review is still a standard work of reference today. The Pauli Exclusion Principle proposes that no two electrons in an atom can be at the same time in the same state or configuration, and it helps explain a wide range of phenomena such as the electron shell structure of atoms. Pauli went on to postulate the existence of the neutrino, which was confirmed in his lifetime. Following further development of his exclusion principle, Pauli was awarded the Nobel Prize in Physics in 1945 for his 'decisive contribution through his discovery of a new law of Nature'. He also had a long correspondence with Jung, and a reputation for accidentally breaking experimental equipment which was dubbed The Pauli Effect.With Frank Close Fellow Emeritus at Exeter College, Universit

Melvyn Bragg and guests discuss Katsushika Hokusai (1760-1849), the Japanese artist whose views of Mt Fuji such as The Great Wave off Kanagawa (pictured) are some of the most iconic in world art. He worked as Japan was slowly moving towards greater contact with the outside world, trading with China and allowing two Dutch ships to dock each year. From these ships he picked up new synthetic colours and illustrations with Western compositions, which he incorporated in his traditional wood block prints. The quality of his images helped drive demand for prints among the highly literate Japanese public, particularly those required to travel to Edo under feudal obligations and who wanted to collect all his prints. As well as the quality of his work, Hokusai's success stems partly from his long life and career. He completed some of his most memorable works in his 70s and 80s and claimed he would not reach his best until he was 110.With Angus Lockyer Lecturer in Japanese History at SOAS University of LondonRosina Buck

Melvyn Bragg and guests discuss what is often called one of the most significant battles in history. In 480BC in the Saronic Gulf near Athens, between the mainland and the island of Salamis, a fleet of Greek allies decisively defeated a larger Persian-led fleet. This halted the further Persian conquest of Greece and, at Plataea and Mycale the next year, further Greek victories brought Persian withdrawal and the immediate threat of conquest to an end. To the Greeks, this enabled a flourishing of a culture that went on to influence the development of civilisation in Rome and, later, Europe and beyond. To the Persians, it was a reverse at the fringes of their vast empire but not a threat to their existence, as it was for the Greek states, and attention turned to quelling unrest elsewhere.With Lloyd Llewellyn-Jones Professor in Ancient History at Cardiff UniversityLindsay Allen Lecturer in Greek and Near Eastern History, King's College LondonandPaul Cartledge Emeritus Professor of Greek Culture and AG Leventis Se

Melvyn Bragg and guests discuss the high temperatures that marked the end of the Paleocene and start of the Eocene periods, about 50m years ago. Over c1000 years, global temperatures rose more than 5 C on average and stayed that way for c100,000 years more, with the surface of seas in the Arctic being as warm as those in the subtropics. There were widespread extinctions, changes in ocean currents, and there was much less oxygen in the sea depths. The rise has been attributed to an increase of carbon dioxide and methane in the atmosphere, though it is not yet known conclusively what the source of those gases was. One theory is that a rise in carbon dioxide, perhaps from volcanoes, warmed up the globe enough for warm water to reach the bottom of the oceans and so release methane from frozen crystals in the sea bed. The higher the temperature rose and the longer the water was warm, the more methane was released. Scientists have been studying a range of sources from this long period, from ice samples to fossils,

Melvyn Bragg and guests discuss Elizabeth Gaskell's novel North and South, published in 1855 after serialisation in Dickens' Household Words magazine. It is the story of Margaret Hale, who was raised in the South in the New Forest and London's Harley Street, and then moves North to a smokey mill town, Milton, in Darkshire. As well as Margaret's emotional life and her growing sense of independence, the novel explores the new ways of living thrown up by industrialisation, and the relationships between 'masters and men'. Many of Margaret Hale's experiences echo Gaskell's own life, as she was born in Chelsea and later moved to Manchester, and the novel has become valued for its insights into social conflicts and the changing world in which Gaskell lived.With Sally Shuttleworth Professor of English Literature at the University of OxfordDinah Birch Pro-vice Chancellor for Research and Professor of English Literature at the University of LiverpoolAndJenny Uglow Biographer of Elizabeth GaskellProducer: Simon Tillotso

Melvyn Bragg and guests discuss the Kuiper Belt, a vast region of icy objects at the fringes of our Solar System, beyond Neptune, in which we find the dwarf planet Pluto and countless objects left over from the origins of the solar system, some of which we observe as comets. It extends from where Neptune is, which is 30 times further out than the Earth is from the Sun, to about 500 times the Earth-Sun distance. It covers an immense region of space and it is the part of the Solar System that we know the least about, because it is so remote from us and has been barely detectable by Earth-based telescopes until recent decades. Its existence was predicted before it was known, and study of the Kuiper Belt, and how objects move within it, has led to a theory that there may be a 9th planet far beyond Neptune.WithCarolin Crawford Public Astronomer at the Institute of Astronomy and Fellow of Emmanuel College, University of CambridgeMonica Grady Professor of Planetary and Space Sciences at the Open UniversityAndStephen

Melvyn Bragg and guests discuss Seneca the Younger, who was one of the first great writers to live his entire life in the world of the new Roman empire, after the fall of the Republic. He was a Stoic philosopher, he wrote blood-soaked tragedies, he was an orator, and he navigated his way through the reigns of Caligula, Claudius and Nero, sometimes exercising power at the highest level and at others spending years in exile. Agrippina the Younger was the one who called for him to tutor Nero, and it is thought Seneca helped curb some of Nero's excesses. He was later revered within the Christian church, partly for what he did and partly for what he was said to have done in forged letters to St Paul. His tragedies, with their ghosts and high body count, influenced Shakespeare's Titus Andronicus and Hamlet, and Kyd's Spanish Tragedy. The image above is the so-called bust of Seneca, a detail from Four Philosophers by Peter Paul Rubens.WithMary Beard Professor of Classics at the University of CambridgeCatharine Edwar

Melvyn Bragg and guests discuss the flourishing of maths in the early Islamic world, as thinkers from across the region developed ideas in places such as Baghdad's House of Wisdom. Among them were the Persians Omar Khayyam, who worked on equations, and Al-Khwarizmi, latinised as Algoritmi and pictured above, who is credited as one of the fathers of algebra, and the Jewish scholar Al-Samawal, who converted to Islam and worked on mathematical induction. As well as the new ideas, there were many advances drawing on Indian, Babylonian and Greek work and, thanks to the recording or reworking by mathematicians in the Islamic world, that broad range of earlier maths was passed on to western Europe for further study.With Colva Roney-Dougal Reader in Pure Mathematics at the University of St AndrewsPeter Pormann Professor of Classics & Graeco-Arabic Studies at the University of ManchesterAndJim Al-Khalili Professor of Physics at the University of SurreyProducer: Simon Tillotson.

In a programme first broadcast in 2017, Melvyn Bragg and guests discuss the Northamptonshire poet John Clare who, according to one of Melvyn's guests Jonathan Bate, was 'the greatest labouring-class poet that England has ever produced'. Clare worked in a tavern, as a gardener and as a farm labourer in the early 19th century and achieved his first literary success with Poems Descriptive of Rural Life and Scenery. He was praised for his descriptions of rural England and his childhood there, and his reaction to the changes he saw in the Agricultural Revolution with its enclosures, displacement and altered, disrupted landscape. Despite poor mental health and, from middle age onwards, many years in asylums, John Clare continued to write and he is now seen as one of the great poets of his age.With Sir Jonathan Bate Provost of Worcester College, University of OxfordMina Gorji Senior Lecturer in the English Faculty and fellow of Pembroke College, Cambridgeand Simon Kövesi Professor of English Literature at Oxford Bro

In a programme first broadcast in 2017, Melvyn Bragg and guests discuss the political philosophy of Hannah Arendt. She developed many of her ideas in response to the rise of totalitarianism in the C20th, partly informed by her own experience as a Jew in Nazi Germany before her escape to France and then America. She wanted to understand how politics had taken such a disastrous turn and, drawing on ideas of Greek philosophers as well as her peers, what might be done to create a better political life. Often unsettling, she wrote of 'the banality of evil' when covering the trial of Eichmann, one of the organisers of the Holocaust.WithLyndsey Stonebridge Professor of Modern Literature and History at the University of East AngliaFrisbee Sheffield Lecturer in Philosophy at Girton College, University of CambridgeandRobert Eaglestone Professor of Contemporary Literature and Thought at Royal Holloway, University LondonProducer: Simon Tillotson.

Melvyn Bragg and guests discuss the relationship between parasites and hosts, where one species lives on or in another to the benefit of the parasite but at a cost to the host, potentially leading to disease or death of the host. Typical examples are mistletoe and trees, hookworms and vertebrates, cuckoos and other birds. In many cases the parasite species do so well in or on a particular host that they reproduce much faster and can adapt to changes more efficiently, and it is thought that almost half of all animal species have a parasitic stage in their lifetime. What techniques do hosts have to counter the parasites, and what impact do parasites have on the evolution of their hosts? With Steve Jones Emeritus Professor of Genetics at University College, LondonWendy Gibson Professor of Protozoology at the University of Bristoland Kayla King Associate Professor in the Department of Zoology at the University of OxfordProducer: Simon Tillotson.

In a programme first broadcast in 2017, Melvyn Bragg and guests discuss the history of Mary, Queen of Scots, who had potential to be one of the most powerful rulers in Europe, yet she was also one of the most vulnerable. In France, when she was the teenage bride to their future king, she was seen as rightful heir to the thrones of England and Ireland, as well as Queen of Scotland and one day of France, which would have been an extraordinary union. She was widowed too young, though and, a Catholic returning to Protestant Scotland, she struggled to overcome rivalries in her own country. She fled to Protestant England, where she was implicated in plots to overthrow Elizabeth, and it was Elizabeth herself who signed Mary's death warrant. With David Forsyth Principal Curator, Scottish Medieval-Early Modern Collections at National Museums ScotlandAnna Groundwater Teaching Fellow in Historical Skills and Methods at the University of EdinburghAndJohn Guy Fellow of Clare College, University of CambridgeProducer: Simon

Melvyn Bragg and guests discuss Nietzsche's On The Genealogy of Morality - A Polemic, which he published in 1887 towards the end of his working life and in which he considered the price humans have paid, and were still paying, to become civilised. In three essays, he argued that having a guilty conscience was the price of living in society with other humans. He suggested that Christian morality, with its consideration for others, grew as an act of revenge by the weak against their masters, 'the blond beasts of prey', as he calls them, and the price for that slaves' revolt was endless self-loathing. These and other ideas were picked up by later thinkers, perhaps most significantly by Sigmund Freud who further explored the tensions between civilisation and the individual.WithStephen Mulhall Professor of Philosophy and a Fellow and Tutor at New College, University of OxfordFiona Hughes Senior Lecturer in Philosophy at the University of EssexAndKeith Ansell-Pearson Professor of Philosophy at the University of War

Melvyn Bragg and guests discuss the German astronomer Johannes Kepler (1571 - 1630). Although he is overshadowed today by Isaac Newton and Galileo, he is considered by many to be one of the greatest scientists in history. The three laws of planetary motion Kepler developed transformed people's understanding of the Solar System and laid the foundations for the revolutionary ideas Isaac Newton produced later. Kepler is also thought to have written one of the first works of science fiction. However, he faced a number of challenges. He had to defend his mother from charges of witchcraft, he had few financial resources and his career suffered as a result of his Lutheran faith. With David Wootton Professor of History at the University of YorkUlinka Rublack Professor of Early Modern European History at the University of Cambridge and Fellow of St John's CollegeAdam Mosley Associate Professor in the Department of History at Swansea University Producer: Victoria Brignell.

Melvyn Bragg and guests discuss Four Quartets, TS Eliot's last great work which he composed, against a background of imminent and actual world war, as meditations on the relationship between time and humanity. With David Moody Emeritus Professor of English and American Literature at the University of YorkFran Brearton Professor of Modern Poetry at Queen's University, BelfastAndMark Ford Professor of English and American Literature at University College LondonProducer: Simon TillotsonJeremy Irons will be reading TS Eliot's greatest poems, from Prufrock to The Waste Land to Four Quartets, across New Year's Day here on Radio 4.

In a programme first broadcast in December 2016, Melvyn Bragg and guests discuss the craze for gin in Britain in the mid-18th century and the attempts to control it. With the arrival of William of Orange, it became an act of loyalty to drink Protestant, Dutch gin rather than Catholic brandy, and changes in tariffs made everyday beer less affordable. Within a short time, production increased and large sections of the population that had rarely or never drunk spirits before were consuming two pints of gin a week. As Hogarth indicated in his print 'Beer Street and Gin Lane' (1751) in support of the Gin Act, the damage was severe, and addiction to gin was blamed for much of the crime in cities such as London. With Angela McShane Research Fellow in History at the Victoria and Albert Museum and University of SheffieldJudith Hawley Professor of 18th century literature at Royal Holloway, University of LondonEmma Major Senior Lecturer in English at the University of YorkProducer: Simon Tillotson

Melvyn Bragg and guests discuss Harriet Martineau who, from a non-conformist background in Norwich, became one of the best known writers in the C19th. She had a wide range of interests and used a new, sociological method to observe the world around her, from religion in Egypt to slavery in America and the rights of women everywhere. She popularised writing about economics for those outside the elite and, for her own popularity, was invited to the coronation of Queen Victoria, one of her readers. WithValerie Sanders Professor of English at the University of HullKaren O'Brien Professor of English Literature at the University of OxfordAndElla Dzelzainis Lecturer in 19th Century Literature at Newcastle UniversityProducer: Simon Tillotson.

Melvyn Bragg and guests discuss Giuseppe Garibaldi and the Italian Risorgimento. According to the historian AJP Taylor, Garibaldi was the only wholly admirable figure in modern history. Born in Nice in 1807, one of Garibaldi's aims in life was the unification of Italy and, in large part thanks to him, Italy was indeed united substantially in 1861 and entirely in 1870. With his distinctive red shirt and poncho, he was a hero of Romantic revolutionaries around the world. His fame was secured when, with a thousand soldiers, he invaded Sicily and toppled the monarchy in the Italian south. The Risorgimento was soon almost complete.This topic is the one chosen from over 750 different ideas suggested by listeners in October, for our yearly Listener Week.WithLucy Riall Professor of Comparative History of Europe at the European University Institute and Professor of History at Birkbeck, University of LondonEugenio Biagini Professor of Modern and Contemporary History at the University of CambridgeandDavid Laven Associat

Melvyn Bragg and guests discuss the Baltic Crusades, the name given to a series of overlapping attempts to convert the pagans of North East Europe to Christianity at the point of the sword. From the 12th Century, Papal Bulls endorsed those who fought on the side of the Church, the best known now being the Teutonic Order which, thwarted in Jerusalem, founded a state on the edge of the Baltic, in Prussia. Some of the peoples in the region disappeared, either killed or assimilated, and the consequences for European history were profound. With Aleks Pluskowski Associate Professor of Archaeology at the University of ReadingNora Berend Fellow of St Catharine's College and Reader in European History at the Faculty of History at the University of Cambridgeand Martin Palmer Director of the International Consultancy on Religion, Education, and CultureProducer: Simon Tillotson.

Melvyn Bragg and guests discuss the ideas brought together under Justinian I, Byzantine emperor in the 6th century AD, which were rediscovered in Western Europe in the Middle Ages and became very influential in the development of laws in many European nations and elsewhere.WithCaroline Humfress Professor of Medieval History at the University of St AndrewsSimon Corcoran Lecturer in Ancient History at Newcastle Universityand Paul du Plessis Senior Lecturer in Civil law and European legal history at the School of Law, University of EdinburghProducer: Simon Tillotson.