Sir Gawain and the Green Knight

Melvyn Bragg and guests discuss theories about the origins of teeth in vertebrates, and what we can learn from sharks in particular and their ancestors. Great white sharks can produce up to 100,000 teeth in their lifetimes. For humans, it is closer to a mere 50 and most of those have to last from childhood. Looking back half a billion years, though, the ancestors of sharks and humans had no teeth in their mouths at all, nor jaws. They were armoured fish, sucking in their food. The theory is that either their tooth-like scales began to appear in mouths as teeth, or some of their taste buds became harder. If we knew more about that, and why sharks can regenerate their teeth, then we might learn how humans could grow new teeth in later lives. With Gareth Fraser Assistant Professor in Biology at the University of FloridaZerina Johanson Merit Researcher in the Department of Earth Sciences at the Natural History Museumand Philip Donoghue Professor of Palaeobiology at the University of BristolProducer: Simon Tillotson

11 Apr 201949min

Melvyn Bragg and guests discuss why the potato crop failures in the 1840s had such a catastrophic impact in Ireland. It is estimated that one million people died from disease or starvation after the blight and another two million left the country within the decade. There had been famines before, but not on this scale. What was it about the laws, attitudes and responses that made this one so devastating?The image above is from The Illustrated London News, Dec. 29, 1849, showing a scalp or shelter, "a hole, surrounded by pools, and three sides of the scalp were dripping with water, which ran in small streams over the floor and out by the entrance. The poor inhabitants said they would be thankful if the landlord would leave them there, and the Almighty would spare their lives. Its principal tenant is Margaret Vaughan."With Cormac O'Grada Professor Emeritus in the School of Economics at University College DublinNiamh Gallagher University Lecturer in Modern British and Irish History at the University of CambridgeAnd Enda Delaney Professor of Modern History and School Director of Research at the University of EdinburghProducer: Simon Tillotson

4 Apr 201957min

Melvyn Bragg and guests discuss the effective partition of England in the 880s after a century of Viking raids, invasions and settlements. Alfred of Wessex, the surviving Anglo-Saxon king and Guthrum, a Danish ruler, had fought each other to a stalemate and came to terms, with Guthrum controlling the land to the east (once he had agreed to convert to Christianity). The key strategic advantage the invaders had was the Viking ships which were far superior and enabled them to raid from the sea and up rivers very rapidly. Their Great Army had arrived in the 870s, conquering the kingdom of Northumbria and occupying York. They defeated the king of Mercia and seized part of his land. They killed the Anglo-Saxon king of East Anglia and gained control of his territory. It was only when a smaller force failed to defeat Wessex that the Danelaw came into being, leaving a lasting impact on the people and customs of that area.With Judith Jesch Professor of Viking Studies at the University of NottinghamJohn Hines Professor of Archaeology at Cardiff UniversityAndJane Kershaw ERC Principal Investigator in Archaeology at the University of OxfordProducer: Simon Tillotson

28 Mars 201950min

Melvyn Bragg and guests discuss the life and works of Hopkins (1844-89), a Jesuit priest who at times burned his poems and at others insisted they should not be published. His main themes are how he, nature and God relate to each other. His friend Robert Bridges preserved Hopkins' poetry and, once printed in 1918, works such as The Windhover, Pied Beauty and As Kingfishers Catch Fire were celebrated for their inventiveness and he was seen as a major poet, perhaps the greatest of the Victorian age. WithCatherine Phillips R J Owens Fellow in English at Downing College, University of CambridgeJane Wright Senior Lecturer in English Literature at the University of Bristoland Martin Dubois Assistant Professor in Nineteenth Century Literature at Durham UniversityProducer: Simon Tillotson

21 Mars 201947min

Melvyn Bragg and guests discuss what it means to be oneself, a question explored by philosophers from Aristotle to the present day, including St Augustine, Kierkegaard, Heidegger and Sartre. In Hamlet, Polonius said 'To thine own self be true', but what is the self, and what does it mean to be true to it, and why should you be true? To Polonius, if you are true to yourself, ‘thou canst not be false to any man’ - but with the rise of the individual, authenticity became a goal in itself, regardless of how that affected others. Is authenticity about creating yourself throughout your life, or fulfilling the potential with which you were born, connecting with your inner child, or something else entirely? What are the risks to society if people value authenticity more than morality - that is, if the two are incompatible? The image above is of Sartre, aged 8 months, perhaps still connected to his inner child.With Sarah Richmond Associate Professor in Philosophy at University College LondonDenis McManus Professor of Philosophy at the University of Southamptonand Irene McMullin Senior Lecturer in Philosophy at the University of EssexProducer: Simon Tillotson

14 Mars 201950min

Melvyn Bragg and guests discuss the impact on the British Isles of William Cecil, 1st Baron Burghley, the most poweful man in the court of Elizabeth I. He was both praised and attacked for his flexibility, adapting to the reigns of Protestant and Catholic monarchs and, under Elizabeth, his goal was to make England strong, stable and secure from attack from its neighbours. He sought control over Ireland and persuaded Elizabeth that Mary Queen of Scots must die, yet often counselled peace rather than war in the interests of prosperity. With Diarmaid MacCulloch Professor of the History of the Church at the University of OxfordSusan Doran Professor of Early Modern British History at the University of Oxfordand John Guy Fellow of Clare College, University of CambridgeProducer: Simon Tillotson

7 Mars 201951min

Melvyn Bragg and guests discuss the life, works, context and legacy of Antarah (525-608AD), the great poet and warrior. According to legend, he was born a slave; his mother was an Ethiopian slave, his father an elite Arab cavalryman. Antarah won his freedom in battle and loved a woman called Abla who refused him, and they were later celebrated in the saga of Antar and Abla. One of Antarah's poems was so esteemed in pre-Islamic Arabia that it is believed it was hung up on the wall of the Kaaba in Mecca. With James Montgomery Sir Thomas Adams's Professor of Arabic at the University of CambridgeMarlé Hammond Senior Lecturer in Arabic Popular Literature and Culture at SOAS, University of LondonAnd Harry Munt Lecturer in Medieval History at the University of YorkProducer: Simon Tillotson

28 Feb 201949min

Melvyn Bragg and guests discuss how members of the same species send each other invisible chemical signals to influence the way they behave. Pheromones are used by species across the animal kingdom in a variety of ways, such as laying trails to be followed, to raise the alarm, to scatter from predators, to signal dominance and to enhance attractiveness and, in honey bees, even direct development into queen or worker. The image above is of male and female ladybirds that have clustered together in response to pheromones. With Tristram Wyatt Senior Research Fellow at the Department of Zoology at the University of OxfordJane Hurst William Prescott Professor of Animal Science at the University of Liverpooland Francis Ratnieks Professor of Apiculture and Head of the Laboratory of Apiculture and Social Insects at the University of SussexProducer: Simon Tillotson

21 Feb 201949min