The Forum

Antonie van Leeuwenhoek opened up a whole new world to us; he was the first to observe bacteria and other microscopic lifeforms which could not be seen by the naked eye. He is now regarded as the father of microbiology and yet he had neither scientific training nor university education, and spent his life first as a linen merchant and then a civil servant in a small Dutch city. To understand quite how game-changing Leeuwenhoek’s discoveries were, you have to imagine a world where just about everyone on the planet could only see things that were within the range of unaided human eyesight. Magnifying glasses were the preserve of a privileged few, and other optical instruments, such as simple telescopes and microscopes, were rarer still. So it’s little wonder that Leeuwenhoek was met with disbelief when he claimed that he had seen bustling, vibrant lifeforms in what for everyone was just a drop of clear, pure water.To find out how this extraordinarily curious Dutchman arrived at his discoveries, Rajan Datar is joined by Elisabeth Entjes who is one of the editors of Leeuwenhoek’s Collected Letters, Tiemen Cocquyt who as curator at the Boerhaave Museum of the history of science in Leiden has a special interest in Leeuwenhoek’s microscopes, and by biochemist and writer Nick Lane who is professor of Evolutionary Biochemistry at University College London.(Photo: Antonie van Leeuwenhoek's microscope. Credit: Rijksmuseum Boerhaave)

A man wakes up in the body of a verminous insect – this is the plot of one of the most celebrated short stories of all time – Franz Kafka’s 1915 novella The Metamorphosis. Dealing with the isolation and absurdity of modern existence, it has fascinated readers all over the world in its openness to varying interpretations, and the way it questions the very norms of society as well as literary form.Joining Rajan Datar to explore this most enigmatic work is Dr Carolin Duttlinger, the author of four books on Kafka and co-director of the Oxford Kafka research centre, Professor Alice Staskova, native of Kafka’s home city of Prague and specialist on Kafka and music, Dr Peter Zusi from the department of Czech Literature at University College London, and with the contribution of the Nigerian novelist Adrian Igoni Barrett who wrote his own take on The Metamorphosis – about a black man in Lagos who wakes up white.(Photo: Kafka's The Metamorphosis choreographed and directed by Arthur Pita at the Linbury Studio Theatre, Royal Opera House, UK. Credit: Robbie Jack/Corbis/Getty Images)

The story of Hugh Masekela’s life is intertwined with the history of South Africa itself. Born into a relatively privileged family in a mining town east of Johannesburg, Masekela was aware from an early age of the separatist and exploitative legacy of colonialism. As he grew up and discovered his love of music, it soon became clear to him that fulfilling his ambitions as a black musician would have to be done far away from the brutal apartheid government which had come to power in 1948. In his adopted home in the United States, Masekela enjoyed a string of hit records and mixed with the great and the good of the jazz world. By now exiled from South Africa, he used his profile and his music to protest against repression and inequality, and wrote one of the defining songs of the campaign to free Nelson Mandela from prison.In his musical ventures he brought musicians together from across the African continent, in a spirit of Pan-Africanism which was so important to him. When he eventually returned to South Africa after thirty years away, he continued to rally for causes close to his heart. Joining Bridget Kendall is jazz historian Dr Lindelwa Dalamba from Wits University in Johannesburg; jazz critic Gwen Ansell and author of Soweto Blues: Jazz, Popular Music, and Politics in South Africa; and the late musician’s nephew and former road manager, Mabusha Masekela.Photo: Hugh Masekela (BBC/Danielle Peck)

In this 200th year since his death, we look at the life and work of James Watt, the Scottish innovator whose ground-breaking ideas helped power the Industrial Revolution and lay the basis for much of the mechanised world we take for granted now. He wasn't the inventor of the first steam engine - that had existed before his time - but his improved steam engine was vastly more efficient than earlier versions. As a result, industrial production rates soared and workplaces were transformed by new machines: changes that were to revolutionise society as well as industry. So who was James Watt? What inspired him and who helped him? Bridget Kendall talks to historians Dr. Malcolm Dick, Director of the Centre for West Midlands History at the University of Birmingham, and Professor Larry Stewart from the University of King's College in Halifax, Nova Scotia, who specialises in early modern science. She is also joined by curators Val Boa from The McLean Museum in Greenock, Scotland that houses an important James Watt collection, and Ben Russell, Curator of Mechanical Engineering at the Science Museum in London where he looks after a number of Watt-related objects, including his legendary attic workshop.Steam escaping from a pressure gauge. (mevans/Getty Images)

The Bhagavad Gita didn't start life as an exclusively religious text but over the two thousand years since it was composed the verses have taken on many different layers of meaning. For millions of Hindus today, the Gita has a similar scriptural status to the Quran for Muslims or the Bible for Christians. In the 20th century, others have seen the Gita as a guide to management strategy, a tool for self-help and even a call to arms for Indian independence in the face of British colonial rule.The story begins on a battlefield with the warrior Prince Arjuna suffering a breakdown. As warring families line up on opposing sides, Arjuna appeals to his charioteer Krishna for help in overcoming this existential crisis. In the 700 verses which follow, Krishna presents his friend with three options: the paths of action, knowledge and devotion.Joining Bridget is Professor Chakravarthi Ram-Prasad from the University of Lancaster in the UK, Professor Angelika Malinar from the University of Zürich, Switzerland, and from the US Professor Richard Davis, the author of The Bhagavad Gita: A Biography.Image: Indian art depicting the dialogue between Lord Krishna and Arjuna. (Fine Art Images/Heritage Images/Getty Images)

King Cnut the Great started life as a young Viking warrior, but quickly became one of the most successful kings in Anglo-Saxon history, reigning over a huge empire covering England, Denmark and Norway in the early 11th Century. For some, he was the perfect Christian king; for others, he was a ruthless warlord. Today in popular culture his name is associated with the tale of King Cnut and the waves - the legend of an arrogant king who believed he could stop the tide.Joining Bridget Kendall to disentangle the facts from legends about King Cnut are Else Roesdahl, professor emerita of Medieval Archaeology at the University of Århus, Denmark; Eleanor Parker, lecturer in Medieval English Literature at Brasenose College, Oxford University, UK; and historian Timothy Bolton, author of the biography Cnut the Great.(Image: An illustration where Cnut criticises his courtiers for believing that he could command the tide of the river. Credit: Bettmann/Getty Images)

The months between May and August 1919 were a crucial time for Afghanistan: it was the period of the Third Anglo-Afghan War followed by the declaration of Afghan independence from Britain. So how was modern Afghan national identity forged? Who were the leaders responsible? Why, in the 19th century, had the country become financially and politically dependent on Britain? And what, a century on, is the legacy Afghanistan's independence struggle?These are some of the issues that Bridget Kendall discusses with historians of Afghanistan, professors Shah Mahmoud Hanifi, Sana Haroon and Benjamin Hopkins. Photo: People hold Afghan flags as they celebrate Afghan Independence Day (Sayed Khodaberdi Sadat/Anadolu Agency/Getty Images)

Rasputin’s story is a familiar one – an illiterate Siberian peasant who managed to secure the confidence of the last Tsar and Tsarina of Russia, while indulging his legendary sexual appetite and love of hard drinking. Rasputin was so revered by his acolytes that they would collect his fingernail clippings, as if they were some kind of holy relic. When his extraordinary life was brought to an equally extraordinary end when he refused to die – murdered eventually in cold blood by a group of aristocrats – it unleashed the Russian revolution, and changed the geopolitical landscape in ways that still resonate today.That’s one version of events that’s held sway for more than one hundred years. And yet so much of the Rasputin legend has been pieced together by those looking to discredit him. Is it possible to peel away the layers of myth-making and get to the heart of who Rasputin really was and what he stood for?Joining Bridget Kendall on a truth-seeking mission is Russian imperial historian Helen Rappaport, author of The Race to Save the Romanovs; Russian literary translator and executive editor of the Los Angeles Review of Books, Boris Dralyuk; and historian Douglas Smith, author of the 2016 biography Rasputin: Faith, Power and the Twilight of the Romanovs.Photo: Grigori Rasputin. (Fine Art Images/Heritage Images/Getty Images)

For as long as humans have gazed up at the moon it has been an object of fascination. From the Aztecs to the Romans to the Romantics, the moon has inspired everything from artistic outpourings to religious devotion. So how has our understanding of our nearest cosmic companion changed over the millennia? And, 50 years on from the Apollo 11 Moon landing, how has our relationship with the moon been changed by our lunar explorations?Rajan Datar talks to Monica Grady, Professor of Planetary and Space Sciences at the Open University in the UK; Anthony Aveni, Professor Emeritus of Astronomy, Anthropology, and Native American Studies at Colgate University in the US; and Alexandra Loske, a German art historian and co-author of Moon: Art, Science, Culture.Photo: A couple have dinner on a hill as the Supermoon is seen in Turkey's Kayseri, 2019. (Sercan Kucuksahin/Anadolu Agency/Getty Images)

Pearls are the most chameleon-like of jewels: they can sell for millions or for just a few dollars, they have been used to symbolize both chastity and debauchery, they have been conspicuously worn by men and women. The production methods of both cultured and natural pearls have been fraught with controversy and their position as fashion and status symbols has waxed and waned over the centuries. Bridget Kendall discovers the social history of pearls with jewellery historian Beatriz Chadour-Sampson and Pittsburgh University professor Molly Warsh. Plus jewellery writer Victoria Finlay puts to the test one of the more colourful claims about what is in essence an iridescent blob of nacre: that if you drop a pearl in a glass of vinegar it will quickly dissolve.(Photo: Pearls in a shell. Credit: Greg Vaughn/VW Pics/UIG/Getty Images)