The KT Boundary

Melvyn Bragg and his guests discuss the evolution and role of Circadian Rhythms, the so-called body clock that influences an organism's daily cycle of physical, behavioural and mental changes. The rhythms are generated within organisms and also in response to external stimuli, mainly light and darkness. They are found throughout the living world, from bacteria to plants, fungi to animals and, in humans, are noticed most clearly in sleep patterns. WithRussell Foster Professor of Circadian Neuroscience at the University of OxfordDebra Skene Professor of Neuroendocrinology at the University of SurreyAndSteve Jones Emeritus Professor of Genetics at University College London.

17 Des 201548min

Melvyn Bragg and guests discuss the origins and rise of Legalism in China, from the start of the Warring States Period (c475 - 221 BC) to the time of The First Emperor Qin Shi Huang (pictured), down to Chairman Mao and the present day. Advanced by the Qin statesman Shang Yang and later blended together by Han Fei, the three main aspects of Legalism were the firm implementation of laws, use of techniques such as responsibility and inscrutability, and taking advantage of the ruler's position. The Han dynasty that replaced the Qin discredited this philosophy for its apparent authoritarianism, but its influence continued, re-emerging throughout Chinese history.WithFrances Wood Former Curator of the Chinese Collections at the British LibraryHilde de Weerdt Professor of Chinese History at Leiden UniversityAndRoel Sterckx Joseph Needham Professor of Chinese History at the University of Cambridge.Producer: Simon Tillotson.

10 Des 201545min

Melvyn Bragg and guests discuss the scientific advances made in the three voyages of Captain James Cook, from 1768 to 1779. Cook's voyages astonished Europeans, bringing back detailed knowledge of the Pacific and its people, from the Antarctic to the Bering Straits. This topic is one of more than a thousand different ideas suggested by listeners in October and came from Alysoun Hodges in the UK, Fiachra O'Brolchain in Ireland, Mhairi Mackay in New Zealand, Enzo Vozzo in Australia, Jeff Radford in British Columbia and Mark Green in Alaska. With Simon Schaffer Professor of the History of Science at the University of CambridgeRebekah Higgitt Lecturer in the History of Science at the University of KentAndSophie Forgan Retired Principle Lecturer at the University of Teesside Chairman of Trustees of the Captain Cook Museum, WhitbyProducer: Simon Tillotson.

3 Des 201547min

Melvyn Bragg and guests discuss the outbreak of witch trials in Massachusetts in 1692-3, centred on Salem, which led to the execution of twenty people, with more dying in prison before or after trial. Some were men, including Giles Corey who died after being pressed with heavy rocks, but the majority were women. At its peak, around 150 people were suspected of witchcraft, including the wife of the governor who had established the trials. Many of the claims of witchcraft arose from personal rivalries in an area known for unrest, but were examined and upheld by the courts at a time of mass hysteria, belief in the devil, fear of attack by Native Americans and religious divisions.With Susan Castillo-Street Harriet Beecher Stowe Professor Emerita of American Studies at King's College LondonSimon Middleton Senior Lecturer in American History at the University of SheffieldAnd Marion Gibson Professor of Renaissance and Magical Literatures at Exeter University, Penryn Campus.Producer: Simon Tillotson.

26 Nov 201545min

"Emma Woodhouse, handsome, clever, and rich, with a comfortable home and happy disposition, seemed to unite some of the best blessings of existence; and had lived nearly twenty-one years in the world with very little to distress or vex her." So begins Emma by Jane Austen, describing her leading character who, she said, was "a heroine whom no-one but myself will much like." Melvyn Bragg and guests discuss this, one of Austen's most popular novels and arguably her masterpiece, a brilliantly sparkling comedy of manners published in December 1815 by John Murray, the last to be published in Austen's lifetime. This followed Sense and Sensibility (1811), Pride and Prejudice (1813) and Mansfield Park (1814), with her brother Henry handling publication of Northanger Abbey and Persuasion (1817). With Janet Todd Professor Emerita of Literature, University of Aberdeen and Honorary Fellow of Newnham College, CambridgeJohn Mullan Professor of English at University College, LondonAndEmma Clery Professor of English at the University of Southampton.Producer: Simon Tillotson.

19 Nov 201547min

Melvyn Bragg and guests discuss The Battle of Lepanto, 1571, the last great sea battle between galleys, in which the Catholic fleet of the Holy League of principally Venice, Spain, the Papal States, Malta, Genoa, and Savoy defeated the Ottoman forces of Selim II. When much of Europe was divided over the Reformation, this was the first major victory of a Christian force over a Turkish fleet. The battle followed the Ottoman invasion of Venetian Cyprus and decades in which the Venetians had been trying to stop the broader westward expansion of the Ottomans into the Mediterranean. The outcome had a great impact on morale in Europe and Pope Pius V established a feast day of Our Lady of Victory. Some historians call it the most significant sea battle since Actium (31 BC). However, the Ottomans viewed the loss as less significant than their victory in Cyprus and, within two years, the Holy League had broken up.WithDiarmaid MacCulloch Professor of the History of the Church at the University of OxfordKate Fleet Director of the Skilliter Centre for Ottoman Studies and Fellow of Newnham College, University of CambridgeAndNoel Malcolm A Senior Research Fellow in History at All Soul's College, University of Oxford Producer: Simon Tillotson.

12 Nov 201548min

Melvyn Bragg and guests discuss the problem of P versus NP, which has a bearing on online security. There is a $1,000,000 prize on offer from the Clay Mathematical Institute for the first person to come up with a complete solution. At its heart is the question "are there problems for which the answers can be checked by computers, but not found in a reasonable time?" If the answer to that is yes, then P does not equal NP. However, if all answers can be found easily as well as checked, if only we knew how, then P equals NP. The area has intrigued mathematicians and computer scientists since Alan Turing, in 1936, found that it's impossible to decide in general whether an algorithm will run forever on some problems. Resting on P versus NP is the security of all online transactions which are currently encrypted: if it transpires that P=NP, if answers could be found as easily as checked, computers could crack passwords in moments.With Colva Roney-Dougal Reader in Pure Mathematics at the University of St AndrewsTimothy Gowers Royal Society Research Professor in Mathematics at the University of CambridgeAnd Leslie Ann Goldberg Professor of Computer Science and Fellow of St Edmund Hall, University of OxfordProducer: Simon Tillotson.

5 Nov 201545min

Melvyn Bragg and guests discuss the Empire of Mali which flourished from 1200 to 1600 and was famous in the wider world for the wealth of rulers such as Mansa Musa. Mali was the largest empire in west Africa and for almost 400 years controlled the flow of gold from mines in the south up to the Mediterranean coast and across to the Middle East. These gold mines were the richest known deposits in the 14th Century and produced around half of the world's gold. When Mansa Musa journeyed to Cairo in 1324 as part of his Hajj, he distributed so much gold that its value depreciated by over 10%. Some of the mosques he built on his return survive, albeit rebuilt, such as the UNESCO World Heritage Site of the Great Mosque of Djenne. With Amira Bennison Reader in the History and Culture of the Maghrib at the University of CambridgeMarie Rodet Senior Lecturer in the History of Africa at SOASAndKevin MacDonald Professor of African Archaeology Chair of the African Studies Programme at University College, London Producer: Simon Tillotson.

29 Okt 201547min