Melvyn Bragg and his guests discuss dark matter, the mysterious and invisible substance which is believed to make up most of the Universe. In 1932 the Dutch astronomer Jan Oort noticed that the speed at which galaxies moved was at odds with the amount of material they appeared to contain. He hypothesized that much of this 'missing' matter was simply invisible to telescopes. Today astronomers and particle physicists are still fascinated by the search for dark matter and the question of what it is.

With

Carolin Crawford

Carlos Frenk

Anne Green

Producer: Simon Tillotson.

Melvyn Bragg and his guests discuss the epic poem Beowulf, one of the masterpieces of Anglo-Saxon literature. Composed in the early Middle Ages by an anonymous poet, the work tells the story of a Scandinavian hero whose feats include battles with the fearsome monster Grendel and a fire-breathing dragon. It survives in a single manuscript dating from around 1000 AD, and was almost completely unknown until its rediscovery in the nineteenth century. Since then it has been translated into modern English by writers including William Morris, JRR Tolkien and Seamus Heaney, and inspired poems, novels and films.

With:

Laura Ashe

Clare Lees

Andy Orchard

Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the history and significance of eunuchs, castrated men who were a common feature of many civilisations for at least three thousand years. Eunuchs were typically employed as servants in royal households in the ancient Middle East, China and classical antiquity. In some civilisations they were used as administrators or senior military commanders, sometimes achieving high office. The tradition lingered until surprisingly recently, with castrated singers remaining a feature of Vatican choirs until the nineteenth century, while the last Chinese eunuch of the imperial court died in 1996.

With:

Karen Radner

Shaun Tougher

Michael Hoeckelmann

Producer: Thomas Morris.

Melvyn Bragg and his guests discuss Adam Smith's celebrated economic treatise The Wealth of Nations. Smith was one of Scotland's greatest thinkers, a moral philosopher and pioneer of economic theory whose 1776 masterpiece has come to define classical economics. Based on his careful consideration of the transformation wrought on the British economy by the Industrial Revolution, and how it contrasted with marketplaces elsewhere in the world, the book outlined a theory of wealth and how it is accumulated that has arguably had more influence on economic theory than any other.

With:

Richard Whatmore

Donald Winch

Helen Paul

Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the photon, one of the most enigmatic objects in the Universe. Generations of scientists have struggled to understand the nature of light. In the late nineteenth century it seemed clear that light was an electromagnetic wave. But the work of physicists including Planck and Einstein shed doubt on this theory. Today scientists accept that light can behave both as a wave and a particle, the latter known as the photon. Understanding light in terms of photons has enabled the development of some of the most important technology of the last fifty years.

With:

Frank Close

Wendy Flavell

Susan Cartwright

Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the Indian Emperor Ashoka. Active in the 3rd century BC, Ashoka conquered almost all of the landmass covered by modern-day India, creating the largest empire South Asia had ever known. After his campaign of conquest he converted to Buddhism, and spread the religion throughout his domain. His edicts were inscribed on the sides of an extraordinary collection of stone pillars spread far and wide across his empire, many of which survive today. Our knowledge of ancient India and its chronology, and how this aligns with the history of Europe, is largely dependent on this important set of inscriptions, which were deciphered only in the nineteenth century.

With:

Jessica Frazier

Naomi Appleton

Richard Gombrich

Producer: Thomas Morris.

Melvyn Bragg and his guests discuss the ancient Greek historian Thucydides. In the fifth century BC Thucydides wrote The History of the Peloponnesian War, an account of a conflict in which he had himself taken part. This work is now seen as one of the first great masterpieces of history writing, a book which influenced writers for centuries afterwards. Thucydides was arguably the first historian to make a conscious attempt to be objective, bringing a rational and impartial approach to his scholarship. Today his work is still widely studied at military colleges and in the field of international relations for the insight it brings to bear on complex political situations.

With:

Paul Cartledge

Katherine Harloe

Neville Morley

Producer: Thomas Morris.

Melvyn Bragg and guests discuss phenomenology, a style of philosophy developed by the German thinker Edmund Husserl in the first decades of the 20th century. Husserl's initial insights underwent a radical transformation in the work of his student Martin Heidegger, and played a key role in the development of French philosophy at the hands of writers like Emmanuel Levinas, Jean-Paul Sartre, Simone de Beauvoir and Maurice Merleau-Ponty.

Phenomenology has been a remarkably adaptable approach to philosophy. It has given its proponents a platform to expose and critique the basic assumptions of past philosophy, and to talk about everything from the foundations of geometry to the difference between fear and anxiety. It has also been instrumental in getting philosophy out of the seminar room and making it relevant to the lives people actually lead.

GUESTS

Simon Glendinning, Professor of European Philosophy in the European Institute at the London School of Economics

Joanna Hodge, Professor of Philosophy at Manchester Metropolitan University

Stephen Mulhall, Professor of Philosophy and Tutor at New College at the University of Oxford

Producer: Luke Mulhall.

Melvyn Bragg and guests discuss Pieter Bruegel the Elder's painting of 1559, 'The Fight Between Carnival And Lent'. Created in Antwerp at a time of religious tension between Catholics and Protestants, the painting is rich in detail and seems ripe for interpretation. But Bruegel is notoriously difficult to interpret. His art seems to reject the preoccupations of the Italian Renaissance, drawing instead on techniques associated with the new technology of the 16th century, print. Was Bruegel using his art to comment on the controversies of his day? If so, what comment was he making?

CONTRIBUTORS

Louise Milne, Lecturer in Visual Culture in the School of Art at the University of Edinburgh and Edinburgh Napier University

Jeanne Nuechterlein, Senior Lecturer in the Department of History of Art, University of York

Miri Rubin, Professor of Medieval and Early Modern History and Head of the School of History at Queen Mary, University of London

Producer: Luke Mulhall.

Melvyn Bragg and his guests discuss the philosophy of truth. Pontius Pilate famously asked: what is truth? In the twentieth century, the nature of truth became a subject of particular interest to philosophers, but they preferred to ask a slightly different question: what does it mean to say of any particular statement that it is true? What is the difference between these two questions, and how useful is the second of them?

With:

Simon Blackburn

Jennifer Hornsby

Crispin Wright

Producer: Victoria Brignell and Luke Mulhall.