The Evolution of Crocodiles

Melvyn Bragg and guests discuss the history of magnetism. Pliny the Elder, in his Historia Naturalis, tells a story of a legendary Greek shepherd called Magnes who, while guiding his flock on Mount Ida, suddenly found it hard to move his feet. The nails of his sandals held fast to the rock beneath them, and the iron tip of his crook was strangely attracted to the boulders all around. Magnes had stumbled across the lodestone, or 'Magnetite', and discovered the phenomenon of magnetism. Plato was baffled by this strange force, as were Aristotle and Galen, and despite being used in navigation, supposedly suspended over the body of Mohammed and deployed in the pursuit of medical cures. St Thomas Aquinas thought magnets had souls. it was not until the late 16th century that any serious scientific attempt was made to explain the mystifying powers of the magnet. Descartes developed a particle theory of magnetism but the great Isaac Newton fought shy of the problem of what caused magnets to attract and repelWho pioneered the study of magnetism? What theories did they construct from its curious abilities and how was the power of the magnet brought out of the realm of magic and into the service of science? With Stephen Pumfrey, Senior Lecturer in the History of Science at the University of Lancaster; John Heilbron, Emeritus Professor of History at the University of California, Berkeley; Lisa Jardine, Professor of Renaissance Studies at Queen Mary, University of London.

29 Sep 200541min

Melvyn Bragg and guests discuss Karl Marx. "Workers of the World Unite! You have nothing to lose but your chains", "Religion is the opium of the people", and "From each according to his abilities, to each according to his needs". That should be enough for most of you to work out whom Radio 4 listeners have voted as their favourite philosopher: the winner of the In Our Time Greatest Philosopher Vote, chosen from 20 philosophers nominated by listeners and carried through on an electoral tidal wave of 28% of our 'first-past-the-post' vote is the communist theoretician, Karl Marx.So, when you strip away the Marxist-Leninism, the Soviet era and later Marxist theory, who was Karl Marx? Where does he stand in the history of philosophy? He wrote in his Theses on Feuerbach, "Philosophers have only interpreted the world in various ways, the point, however, is to change it" - which begs the question, is he really a philosopher at all?With Anthony Grayling, Professor of Philosophy at Birkbeck College, University of London; Francis Wheen, journalist and author of a biography of Karl Marx; Gareth Stedman Jones, Professor of Political Science at Cambridge University.

14 Jul 200542min

Melvyn Bragg and guests discuss Christopher Marlowe. In the prologue to The Jew of Malta Christopher Marlowe has Machiavel say:"I count religion but a childish toy, And hold there is no sin but ignorance. Birds of the air will tell of murders past! I am ashamed to hear such fooleries.Many will talk of title to a crown. What right had Caesar to the empire? Might first made kings, and laws were then most sure When, like the Draco's, they were writ in blood."A forger, a brawler, a spy, a homosexual and accused of atheism but above all a playwright and poet, Christopher Marlowe was the most celebrated writer of his generation, bringing Tamburlaine, Faustus and The Jew of Malta to the stage and far outshining William Shakespeare during his lifetime. Then came his mysterious death at 29, days before he was due to appear on trial accused of heresy. Was he stabbed in an argument over a bill? Was he assassinated? And how does his work measure up to Shakespeare, a man who paid generous tribute and some say stole some of his best lines? Was Marlowe assassinated by the Elizabethan state? How subversive was his literary work? And had he lived as long as his contemporary Shakespeare, how would he have compared?With Katherine Duncan-Jones, Senior Research Fellow in the English Faculty of Oxford University; Jonathan Bate, Professor of English Literature, University of Warwick; Emma Smith, Lecturer in English, Oxford University.

7 Jul 200542min

Melvyn Bragg and guests discuss the legendary wizard Merlin. He was sired by an incubus and born of a virgin; he was a prophet, a shape-shifter, a king-maker and a mad man of the woods. Before Gandalf there was Merlin: the power behind Arthur and a literary sensation for centuries. In a literary career spanning 1500 years, Merlin, or originally Myrddin, put the sword in the stone, built Stonehenge, knew the truth behind the Holy Grail and discovered the Elixir of Life. "Beware Merlin for he knows all things by the devil's craft" say the poisoners in Malory's Morte D'Arthur; but he is also on the side of the good and is almost Christ-like in some of the versions of his tale, and his prophesies were pored over by the medieval Church. Who was Merlinus Ambrosius, as he is sometimes known? Where does his legend spring from and how has it been appropriated and adapted over time?With Juliette Wood, Associate Lecturer in the Department of Welsh at Cardiff University, Stephen Knight, Distinguished Research Professor in English Literature at Cardiff University, Peter Forshaw, Lecturer in Renaissance Philosophies at Birkbeck, University of London.

30 Jun 200528min

Melvyn Bragg and guests discuss the KT Boundary. Across the entire planet, where it hasn't been eroded or destroyed in land movements, there is a thin grey line. In Italy it is 1 cm thick, in America it stretches to three centimetres, but it is all the same thin grey line laid into the rock some 65 million years ago and it bears witness to a cataclysmic event experienced only once in Earth's history. It is called the KT Boundary and geologists believe it is the clue to the death of the dinosaurs and the ultimate reason why mammals and humans inherited the Earth.But exactly what did happen 65 million years ago? How was this extraordinary line created across the Earth and does it really hold the key to the death of the dinosaurs?With Simon Kelley, Head of Department in the Department of Earth Sciences, Open University, Jane Francis, Professor of Palaeoclimatology, University of Leeds; Mike Benton, Professor of Vertebrate Palaeontology in the Department of Earth Sciences, University of Bristol.

23 Jun 200542min

Melvyn Bragg and guests discuss paganism in the Renaissance. For hundreds of years in the Middle Ages, the only way to read Ovid was through the prism of a Christian moralising text. Ovid's sensual tales of metamorphosis and pagan gods were presented as veiled allegories, and the famous story of Zeus descending to Danae in a shower of gold was explained as the soul receiving divine illumination. But in 1478 Botticelli finished Primavera, the first major project on a mythological theme for a thousand years, and by 1554 Titian completed a very different version of Danae - commissioned by a Cardinal, no less - where she expectantly awaits her union with Zeus in what is a nakedly sexual pose. What happened to bring the myths and eroticism of antiquity back into the culture of Europe? And how was it possible for a Church that was prosecuting for heresy, to exalt in pagan imagery, even in the Vatican itself?With Tom Healy, Professor of Renaissance Studies, Birkbeck College, University of London; Charles Hope, Director of the Warburg Institute and Professor of the History of the Classical Tradition, University of London; Evelyn Welch, Professor of Renaissance Studies at Queen Mary, University of London.

16 Jun 200541min

Melvyn Bragg and guests discuss the Scriblerus Club. The 18th century Club included some of the most extraordinary and vivid satirists ever to have written in the English language. We are given giants and midgets, implausible unions with Siamese twins, diving competitions into the open sewer of Fleet-ditch, and Olympic-style pissing competitions: "Who best can send on high/The salient spout, far streaming to the sky". But these exotic images were part of an attempt by Pope, Swift and their cadres to show a world in terrible decline: "Religion, blushing, veils her sacred fires,And unawares Morality expires.Nor public flame, nor private dares to shine;Nor human spark is left, nor glimpse divine!Lo! Thy dread empire, Chaos! Is restored:Light dies before thy uncreating word".So wrote Alexander Pope in his great mock epic verse, The Dunciad. Who were the Scriblerans? And what in eighteenth century society had driven them to such disdain and despair?With John Mullan, Senior Lecturer in English, University College London; Judith Hawley, Senior Lecturer in English, Royal Holloway, University of London; Marcus Walsh, Kenneth Allott Professor of English Literature, University of Liverpool.

9 Jun 200542min

Melvyn Bragg and guests discuss Renaissance Mathematics. As with so many areas of European thought, mathematics in the Renaissance was a question of recovering and, if you were very lucky, improving upon Greek ideas. The geometry of Euclid, Appollonius and Ptolemy ruled the day. Yet within two hundred years, European mathematics went from being an art that would unmask the eternal shapes of geometry to a science that could track the manifold movements and changes of the real world. The Arabic tradition of Algebra was also assimilated. In its course it changed the way people understood numbers, movement, time, even nature itself and culminated in the calculus of Isaac Newton and Gottfried Leibniz. But how did this profound change come about? What were the ideas that drove it and is this the period in which mathematics became truly modern?With Robert Kaplan, co-founder of the Maths Circle at Harvard University; Jim Bennett, Director of the Museum of Science and Fellow of Linacre College, University of Oxford; Jackie Stedall, Research Fellow in the History of Mathematics, The Queen's College, Oxford.

2 Jun 200542min