In Our Time

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 Oxford Jane Hurst William Prescott Professor of Animal Science at the University of Liverpool and Francis Ratnieks Professor of Apiculture and Head of the Laboratory of Apiculture and Social Insects at the University of Sussex Producer: Simon Tillotson

Melvyn Bragg and guests discuss how artists from the Middle Ages onwards have been inspired by the Bible story of the widow who killed an Assyrian general who was besieging her village, and so saved her people from his army and from his master Nebuchadnezzar. A symbol of a woman's power and the defiance of political tyranny, the image of Judith has been sculpted by Donatello, painted on the ceiling of the Sistine Chapel and, in the case of Caravaggio, Liss and Artemisia Gentileschi, been shown with vivid, disturbing detail. What do these interpretations reveal of the attitudes to power and women in their time, and of the artists' own experiences? The image of Judith, above is from a tapestry in the Duomo, Milan, by Giovanni or Nicola Carcher, 1555 With Susan Foister Curator of Early Netherlandish, German and British Painting at the National Gallery John Gash Senior Lecturer in History of Art at the University of Aberdeen And Ela Nutu Hall Research Associate at the Sheffield Institute for Interdisciplinary Biblical Studies, at the University of Sheffield Producer: Simon Tillotson

Melvyn Bragg and guests discuss the remarkable achievement of Aristotle (384-322BC) in the realm of biological investigation, for which he has been called the originator of the scientific study of life. Known mainly as a philosopher and the tutor for Alexander the Great, who reportedly sent him animal specimens from his conquests, Aristotle examined a wide range of life forms while by the Sea of Marmara and then on the island of Lesbos. Some ideas, such as the the spontaneous generation of flies, did not survive later scrutiny, yet his influence was extraordinary and his work was unequalled until the early modern period. The image above is of the egg and embryo of a dogfish, one of the animals Aristotle described accurately as he recorded their development. With Armand Leroi Professor of Evolutionary Development Biology at Imperial College London Myrto Hatzimichali Lecturer in Classics at the University of Cambridge And Sophia Connell Lecturer in Philosophy at Birkbeck, University of London Producer: Simon Tillotson

Melvyn Bragg and guests discuss the life of the Welsh nobleman, also known as Owen Glendower, who began a revolt against Henry IV in 1400 which was at first very successful. Glyndwr (c1359-c1415) adopted the title Prince of Wales and established a parliament and his own foreign policy, until he was defeated by the future Henry V. Owain Glyndwr escaped and led guerilla attacks for several years but was never betrayed to the English, disappearing without trace. With Huw Pryce Professor of Welsh History at Bangor University Helen Fulton Professor of Medieval Literature at the University of Bristol Chris Given-Wilson Emeritus Professor of Medieval History at the University of St Andrews Producer: Simon Tillotson

Melvyn Bragg and guests discuss the ideas and life of one of the greatest mathematicians of the 20th century, Emmy Noether. Noether’s Theorem is regarded as one of the most important mathematical theorems, influencing the evolution of modern physics. Born in 1882 in Bavaria, Noether studied mathematics at a time when women were generally denied the chance to pursue academic careers and, to get round objections, she spent four years lecturing under a male colleague’s name. In the 1930s she faced further objections to her teaching, as she was Jewish, and she left for the USA when the Nazis came to power. Her innovative ideas were to become widely recognised and she is now considered to be one of the founders of modern algebra. With Colva Roney Dougal Professor of Pure Mathematics at the University of St Andrews David Berman Professor in Theoretical Physics at Queen Mary, University of London Elizabeth Mansfield Professor of Mathematics at the University of Kent Producer: Simon Tillotson