Melvyn Bragg and his guests discuss Voltaire's novel Candide. First published in 1759, the novel follows the adventures of a young man, Candide, and his mentor, the philosopher Pangloss. Candide was written in the aftermath of a major earthquake in Lisbon and the outbreak of the Seven Years' War, events which caused such human suffering that they shook many people's faith in a benevolent God. Voltaire's masterpiece piles ridicule on Optimism, the fashionable philosophical belief that such disasters are part of God's plan for humanity - that 'all is for the best in this best of all possible worlds'.Often uproariously funny, the novel is a biting satire whose other targets include bad literature, extremist religion and the vanity of kings and politicians. It captivated contemporary readers and has proved one of French literature's most enduring classics.With:David WoottonAnniversary Professor of History at the University of YorkNicholas CronkProfessor of French Literature and Director of the Voltaire Foundation at the University of OxfordCaroline WarmanLecturer in French and Fellow of Jesus College at the University of Oxford.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Battle of Bosworth Field, the celebrated encounter between Lancastrian and Yorkist forces in August 1485. The battle, the penultimate of the Wars of the Roses, resulted in the death of Richard III. The victory of Henry Tudor enabled him to succeed Richard as monarch and establish the Tudor dynasty which was to rule for over a century. These events were immortalised by Shakespeare in Richard III, and today the battle is regarded as one of the most important to have taken place on English soil. But little is known about what happened on the battlefield, and the very location of the encounter remains the subject of much debate.With:Anne CurryProfessor of Medieval History and Dean of Humanities at the University of SouthamptonSteven GunnTutor and Fellow in Modern History at Merton College, OxfordDavid GrummittLecturer in British History at the University of Kent.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss Neoplatonism, the school of thought founded in the 3rd century AD by the philosopher Plotinus. Born in Egypt, Plotinus was brought up in the Platonic tradition, studying and reinterpreting the works of the Greek thinker Plato. After he moved to Rome Plotinus became the most influential member of a group of thinkers dedicated to Platonic scholarship. The Neoplatonists - a term only coined in the nineteenth century - brought a new religious sensibility to bear on Plato's thought. They outlined a complex cosmology which linked the human with the divine, headed by a mysterious power which they called the One. Neoplatonism shaped early Christian, Jewish and Muslim religious scholarship, and remained a dominant force in European thought until the Renaissance. With:Angie HobbsAssociate Professor of Philosophy and Senior Fellow in the Public Understanding of Philosophy at the University of WarwickPeter AdamsonProfessor of Ancient and Medieval Philosophy at King's College LondonAnne SheppardProfessor of Ancient Philosophy at Royal Holloway, University of LondonProducer: Thomas Morris.

Melvyn Bragg and his guests discuss the emergence of geology as a scientific discipline. A little over two hundred years ago a small group of friends founded the Geological Society of London. This organisation was the first devoted to furthering the discipline of geology - the study of the Earth, its history and composition. Although geology only emerged as a separate area of study in the late eighteenth century, many earlier thinkers had studied rocks, fossils and the materials from which the Earth is made. Ancient scholars in Egypt and Greece speculated about the Earth and its composition. And in the Renaissance the advent of mining brought further insight into the nature of objects found underground and how they got there. But how did such haphazard study of rocks and fossils develop into a rigorous scientific discipline?With:Stephen PumfreySenior Lecturer in the History of Science at Lancaster UniversityAndrew ScottProfessor of Applied Palaeobotany at Royal Holloway, University of LondonLeucha VeneerResearch Associate at the Centre for the History of Science, Technology and Medicine at the University of Manchester.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the origins of Quakerism. In the mid-seventeenth century an itinerant preacher, George Fox, became the central figure of a group known as the Religious Society of Friends, whose members believed it was possible to obtain contact with Christ without priestly intercession. The Quakers, as they became known, rejected the established Church and what they saw as the artificial pomp and artifice of its worship. They argued for religious toleration and for the equality of men and women. Persecuted for many years, particularly after the Restoration of Charles II in 1660, the Quakers survived to become an influential religious group, known for their pacifism and philanthropy. With:Justin ChampionProfessor of the History of Early Modern Ideas at Royal Holloway, University of LondonJohn CoffeyProfessor of Early Modern History at the University of LeicesterKate PetersFellow in History at Murray Edwards College at the University of Cambridge.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the measurement of time. Early civilisations used the movements of heavenly bodies to tell the time, but even in the ancient world more sophisticated timekeeping devices such as waterclocks were known. The development of mechanical clocks in Europe emerged in the medieval period when monks used such devices to sound an alarm to signal it was the hour to pray, although these clocks did not tell them the time. For hundreds of years clocks were inaccurate and it proved hard to remedy the problems, let alone settle on a standard time that the country should follow. It was with the advent of the railways that time finally became standardised in Britain in the mid-19th century and only in 1884 that Greenwich became the prime meridian of the world. Atomic clocks now mark the passing of the days, hours, and minutes and they are capable of keeping time to a second in 15 million years. With:Kristen LippincottFormer Director of the Royal Observatory, GreenwichJim BennettDirector of the Museum of the History of Science at the University of OxfordJonathan BettsSenior Curator of Horology at the Royal Observatory, GreenwichProducer: Natalia Fernandez.

Melvyn Bragg and his guests discuss the work and influence of the eighteenth-century philosopher Moses Mendelssohn. A prominent figure at the court of Frederick the Great, Mendelssohn was one of the most significant thinkers of his age. He came from a humble, but culturally rich background and his obvious intelligence was recognised from a young age and nurtured by the local rabbi where he lived in the town of Dessau in Prussia. Moses's learning earned him the sobriquet of the 'German Socrates' and he is considered to be one of the principal architects of the Haskala, the Jewish Enlightenment, and widely regarded as having helped bring Judaism into the mainstream of European culture. Mendelssohn is perhaps best remembered today for his efforts to bring Jewish and German culture closer together and for his plea for religious toleration.With:Christopher ClarkProfessor of Modern European History at the University of CambridgeAbigail GreenTutor and Fellow in History at the University of OxfordAdam SutcliffeSenior Lecturer in European History at King's College, London Producer: Natalia Fernandez.

Melvyn Bragg and his guests discuss Vitruvius' De Architectura. Written almost exactly two thousand years ago, Vitruvius' work is a ten-volume treatise on engineering and architecture, the only surviving work on the subject from the ancient world. This fascinating book offers unique insights into Roman technology and contains discussion of the general principles of architecture, the training of architects and the design of temples, houses and public buildings.The rediscovery of this seminal treatise in the 15th century provided the impetus for the neoclassical architectural movement, and Vitruvius exerted a significant influence on the work of Renaissance architects including Palladio, Brunelleschi and Alberti. It remains a hugely important text today, two millennia after it was written.With:Serafina CuomoReader in Roman History at Birkbeck, University of LondonRobert TavernorEmeritus Professor of Architecture and Urban Design at the London School of EconomicsAlice KoenigLecturer in Latin and Classical Studies at the University of St Andrews.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss Lyrical Ballads, the collection of poems by William Wordsworth and Samuel Coleridge first published in 1798. The work was conceived as an attempt to cast off the stultifying conventions of formal 18th-century poetry. Wordsworth wrote that the poems it contains should be "considered as experiments. They were written chiefly with a view to ascertain how far the language of conversation in the middle and lower classes of society is adapted to the purpose of poetic pleasure."Lyrical Ballads contains some of the best-known work by Coleridge and Wordsworth, including The Rime of the Ancient Mariner and Tintern Abbey - and is today seen as a point of radical departure for poetry in English.With:Judith HawleyProfessor of Eighteenth-Century Literature at Royal Holloway, University of LondonJonathan BateProvost of Worcester College, OxfordPeter SwaabReader in English Literature at University College London.Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the life and work of Benjamin Franklin. A printer, statesman, diplomat, writer and scientist, Franklin was one of the most remarkable individuals of the eighteenth century. His discoveries relating to the nature of electricity, and in particular a celebrated experiment which involved flying a kite in a thunderstorm, made him famous in Europe and America. His inventions include bifocal spectacles, and a new type of stove. In the second half of his life he became prominent as a politician and a successful diplomat. As the only Founding Father to have signed all three of the fundamental documents of the United States of America, including its Declaration of Independence and Constitution, Benjamin Franklin occupies a unique position in the history of the nation. With:Simon MiddletonSenior Lecturer in American History at the University of SheffieldSimon NewmanSir Denis Brogan Professor of American History at the University of GlasgowPatricia FaraSenior Tutor at Clare College, University of Cambridge.Producer: Thomas Morris.