Melvyn Bragg discusses 'Lives of the Artists' - the great biographer Giorgio Vasari's study of Renaissance painters, sculptors and architects. In 1550 a little known Italian artist, Giorgio Vasari, published a revolutionary book entitled 'Lives of the Most Excellent Italian Painters, Sculptors, and Architects, from Cimabue to Our Times'. In it he chronicled the evolution of Italian art from the early pioneer Giotto to the perfection of Michelangelo.For the first time, Vasari set out to record artists' eccentricities and foibles as well as their artistic triumphs. We learn that the painter Piero di Cosimo was scared of the sound of bells, and witness Donatello shouting at his statues. But amongst these beguiling stories of human achievement, Vasari also explained his own theory of what made great art.In more recent decades, Vasari has been criticised for not allowing factual accuracy to get in the way of a good story. Nonetheless, the influence of his work has been unparalleled. It has formed and defined the way we think about Renaissance art to this day and some credit him with being the founder of the discipline of the history of art. Few artists that Vasari criticised have been comprehensively rehabilitated and Vasari's semi-divine trio of Michelangelo, Raphael and Leonardo are still seen as the apotheosis of artistic perfection. With:Evelyn WelchProfessor of Renaissance Studies and Academic Dean for Arts at Queen Mary, University of LondonDavid EkserdjianProfessor of History of Art and Film at the University of LeicesterMartin KempEmeritus Professor in the History of Art at the University of OxfordProducer: Thomas Morris.

Discover how the wealthy Cavendish family shaped British science from the 1600s to 1800s, from patronage to pioneering experiments. Delve into controversies at the Royal Society and Henry Cavendish's contributions to chemistry. Explore the legacy of the Cavendish Laboratory and Maxwell's advancements in physics.

Melvyn Bragg and guests discuss 'The Varieties of Religious Experience' by William James. The American novelist Henry James famously made London his home and himself more English than the English. In contrast, his psychologist brother, William, was deeply immersed in his American heritage. But in 1901, William came to Britain too. He had been invited to deliver a series of prestigious public lectures in Edinburgh. In them, he attempted a daringly original intellectual project. For the first time, here was a close-up examination of religion not as a body of beliefs, but as an intimate personal experience. When the lectures were printed, as 'The Varieties of Religious Experience', they were an instant success.They laid the ground for a whole new area of study - the psychology of religion - and influenced figures from the psychiatrist Carl Jung to the novelist Aldous Huxley. To date, James's book has been reprinted thirty-six times and has been hailed as one of the best non-fiction books of the twentieth century.With:Jonathan ReeFreelance philosopherJohn HaldaneProfessor of Philosophy at the University of St AndrewsGwen Griffith-DicksonEmeritus Professor of Divinity at Gresham College and Director of the Lokahi FoundationProducer: Natasha Emerson.

The Cool Universe is the name astronomers give to the matter between the stars.These great clouds of dust and gas are not hot enough to be detected by optical telescopes.But over the last few decades, they have increasingly become the focus of infrared telescopy.Astronomers had long encountered dark, apparently starless patches in the night sky. When they discovered that these were actually areas obscured by dust, they found a way to see through these vexing barriers, using infrared telescopes, to the light beyond.However, more recently, the dust itself has become a source of fascination.The picture now being revealed by infrared astronomy is of a universe that is dynamic.In this dynamic universe, matter is recycled - and so the dust and gas of the Cool Universe play a vital role. They are the material from which the stars are created, and into which they finally disintegrate, enriching the reservoir of cool matter from which new stars will eventually be formed. As a result of the new research, we are now beginning to see first-hand the way our planet was formed when the solar system was born.With:Carolin CrawfordMember of the Institute of Astronomy, and Fellow of Emmanuel College, at the University of CambridgePaul MurdinVisiting Professor of Astronomy at Liverpool John Moores University's Astronomy Research InstituteMichael Rowan-RobinsonProfessor of Astrophysics at Imperial College, LondonProducer: Phil Tinline.

Melvyn Bragg and guests discuss the Great Wall of China.The Great Wall is not a single Wall. It is not visible from space, contrary to popular belief, as it is much too thin. But it remains a spectacular architectural and historical phenomenon.The Great Wall's military importance, and its symbolic power, have varied widely in its long existence, as its place in Chinese life has shifted with the country's history. It was initially constructed at the command of the first Emperor, from 221 BC, and was a combination of the various protective walls that had been built by the smaller states which he had conquered and merged to form China. The original Wall was made of pounded earth, and in places the wind-carved remains of this two thousand year old construction are still visible. But the Wall which is familiar to us today is the work of the Ming Dynasty, and its vast programme of reinforcement - prompted by a renewed threat from the Mongols in the north. In the 17th century, amazed Jesuits sent back reports to Europe about the Wall, and ever since it has held a powerful place in the imagination of the West. Some scholars argue that this in turn has shaped the modern Chinese appreciation of their astounding inheritance.Julia LovellLecturer in Chinese History at Birkbeck College, University of LondonRana MitterProfessor of the History and Politics of Modern China at the University of OxfordFrances WoodHead of the Chinese Section at the British LibraryPRODUCER: PHIL TINLINE.

Melvyn Bragg and guests discuss Roman Satire. Much of Roman culture was a development of their rich inheritance from the Greeks. But satire was a form the Romans could claim to have invented. The grandfather of Roman satire, Ennius, was also an important figure in early Roman literature more generally. Strikingly, he pioneered both epic and the satirical mockery of epic.But the father of the genre, Lucilius, is the writer credited with taking satire decisively towards what we now understand by the word: incisive invective aimed at particular personalities and their wrongs.All this happened under the Roman Republic, in which there was a large measure of free speech. But then the Republic was overthrown and Augustus established the Empire.The great satirist Horace had fought to save the Republic, but now reinvented himself as a loyal citizen of the Imperium. His satirical work explores the strains and hypocrisies of trying to maintain an independent sense of self at the heart of an autocracy.This struggle was deepened in the work of Persius, whose Stoicism-inflected writing was a quietist attempt to endure under the regime without challenging it.The work of the last great Roman satirist, Juvenal, was famously savage - yet his targets were either generic or long dead. So was satire a conservative or a radical genre? Was it cynical or did it aim to 'improve' people? Did it have any real impact? And was it actually funny?With:Mary BeardProfessor of Classics at Cambridge UniversityDenis FeeneyProfessor of Classics and Giger Professor of Latin at Princeton UniversityDuncan KennedyProfessor of Latin Literature and the Theory of Criticism at the University of BristolProducer: Phil Tinline.

Delve into the meteoric rise of the Zulu Nation under warrior king Shaka, their clashes with European settlers, and the pivotal Zulu War of 1879 against the British. Explore the impact of diamond discovery on the region's economy and the innovative military strategies that made the Zulus a formidable force.

Melvyn Bragg and guests discuss the life and works of William Hazlitt. Hazlitt is best known for his essays, which ranged in subject matter from Shakespeare, through his first meeting with Samuel Taylor Coleridge, to a boxing match. What is less well-known, however, is that he began his writing life as a philosopher, before deliberately abandoning the field for journalism. Nonetheless, his early reasoning about the power of the imagination to take human beings beyond narrow self-interest, as encapsulated in his 'Essay on the Principles of Human Action', shines through his more popular work.Hazlitt is a figure full of contradictions - a republican who revered Napoleon, and a radical who admired the conservative philosopher Edmund Burke. His reputation suffered terribly from his book 'Liber Amoris', a self-revealing memoir of his infatuation with his landlady's daughter. But in the Victorian and Edwardian eras, his importance was acknowledged by writers like Charles Dickens, Robert Louis Stevenson and Ford Madox Ford. In the 180 years since his death, his stature as perhaps the finest essayist in the language has grown and grown. With:Jonathan BateProfessor of English Literature at the University of Warwick Anthony GraylingProfessor of Philosophy at Birkbeck College, University of LondonUttara NatarajanSenior Lecturer in the Department of English and Comparative Literature at Goldsmiths College, University of LondonProducer: Phil Tinline.

Melvyn Bragg presents the second of a two part discussion about the history of the city. George Stephenson invented rail transport in the north-east of England in the 1820s, but it was not until over twenty years later that rail networks began to spring up to ferry workers in and out of the centre of British cities. When they did, this had a vast, transforming effect on the whole nature of cities - taking the pressure off dense, overcrowded central areas, but helping cities like London explode outwards.Victorian London was widely held at the time to be rather chaotic - especially in comparison with the grandiose, highly-orchestrated developments in continental European cities like Paris and Barcelona.The process of transformation was given another fillip by the introduction of the motor car. In this, the final part of a two-part special edition of 'In Our Time' exploring the development of cities, we're going to examine how Stephenson's invention transformed cities almost beyond recognition, and follow the story up to the present day.Peter Hall is Professor of Planning and Regeneration at The Bartlett School of Planning, University College London; Tristram Hunt is lecturer in History at Queen Mary College at the University of London; and Ricky Burdett is Professor of Urban Studies at the London School of Economics.

Melvyn Bragg presents the first of a two-part discussion about the history of the city. With Peter Hall, Julia Merritt and Greg Woolf.The story of cities is widely held to begin in the 8th millennium BC in Mesopotamia. By 4000 BC, there were cities in the Indus Valley, by 3000 BC in Egypt, and by 2000 BC in China. What happened in the west was the furthest ripple of that phenomenon. In 1000 BC Athens still only had a population of one thousand. At its height, Athens' position as a powerful Mediterranean trading city allowed it to become the birthplace of much that would later characterise western cities, from politics through architecture to culture. Then, early in the first millenium AD, the world saw its first million-strong city: Rome. Maintaining a population of this size required stupendous feats of organisation and ingenuity. But in following centuries, as Rome declined and fell, the city itself, in the west at least, declined too; power emanated from kings and their mobile courts, rather than particular settlements.In China, urban trading posts continued to flourish, but their innovative energy dwindled before the end of the first millennium. Between 1150 and the onset of the Black Death in 1350, the city underwent a resurgence in Europe. City-states developed in Italy and in Germany. At this stage, there was no omnipotent power-centre to match Ancient Rome. But with the growth of sea and then ocean trade, and the centralisation of power in capitals ruling nation-states, cities like London, Paris, Madrid, Amsterdam and St Petersburg became increasingly wealthy, dynamic and ostentatious. By 1801, one of these - London - finally matched Ancient Rome's peak population of a million. Along the way, the city had become an ideal to be revered and a spectre to be feared.Peter Hall is Professor of Planning and Regeneration at The Bartlett School of Planning, University College London; Julia Merritt is Associate Professor of History at the University of Nottingham; Greg Woolfis Professor of Ancient History at the University of St Andrews.