Coal is a commodity that’s often been considered dirty, old fashioned and cheap, a humble black stone that evokes images of soot covered workers. And yet this lump of energy became the essential fuel for industrialisation all over the world, transforming societies and launching empires. But this transformative power came at a cost, as well as bringing unprecedented wealth it also brought unprecedented pollution. So how are countries dealing with coal’s legacy, and will dependence on coal carry on into the future?

Joining Rajan Datar is Dr Kenneth Mathu from Gibs, University of Pretoria in Johannesburg; Dr Shellen Xiao Wu, specialist on China and author of “Empires of Coal”; the American environmental lawyer Barbara Freese who’s written “Coal: A human history”, and Darran Cowd, the manager of Kent Mining museum in South East England.

Photo: coal being loaded onto a truck at a mine in China. (MichelTroncy/Gamma-Rapho/Getty Images)

Toilets come in many shapes and sizes around the world: squat and throne, dry and flush, indoor and outdoor. Most of us use one every day, but over two billion people still do not have access to facilities, leading to health and sanitary problems and even risks for personal security.

From the 50 seater public toilets of ancient Rome and the modern flush toilet, invented by a godson of a 16th century British monarch, this feat of human engineering is believed to date back 5000 years to the Indus Valley Civilisation. In recent years it’s become a battleground for equality, but in a world of increasing water shortages, could the flush toilet become a thing of the past?

Joining Bridget Kendall to discuss the history of the toilet are Ann Koloski-Ostrow - an archaeologist specialising in Roman toilets from Brandeis University in the United States; Barbara Penner - a Professor of Architectural Humanities from University College London and the author of books on public toilets and the modern bathroom; and Dr Bindeswar Pathak - a sociologist, social activist, and Founder of the Sulabh Sanitation and Social Reform Movement. He is also the inventor of an environmentally friendly compost toilet that’s used widely around India today.

Photo: A close-up of a toilet (Getty Images)

Stoicism is a school of thought over two thousand years old that asked how to live "a good life" in an unpredictable world, and how to make the best of what is in our power, while accepting the rest as it happens naturally. It trumpeted the value of reason as man's most valuable Virtue, and offered a practical guide to remaining steadfast, strong and in control.

This ancient Graeco-Roman philosophy had a broad influence that reached across time and disciplines: its Virtues inspired some of the same from Christianity in the Middle Ages, its belief in Reason spoke to the works of 18th Century German philosopher Immanuel Kant, and the relationship it drew between judgement and emotion went on to inspire the modern Cognitive Behavioural Therapy Movement.

Bridget Kendall discusses this philosophy's key ideas and evolution, and explores what it is to live like a Stoic in the modern world with guests Massimo Pigliucci, Nancy Sherman and Donald Robertson.

Photo: Equestrian statue of Marcus Aurelius, 161-180, a practitioner of Stoicism. (Credit: Getty Images)

Around the twelfth and thirteenth century CE Angkor was thought to be one of the world's biggest cities. Its massive temple complex at Angkor Wat covered hundreds of acres adorned with majestic towers, terraces and waterways: symbols of the might of the Khmer kings who ruled the region. Angkor Wat attracts millions of tourists every year and has pride of place on the Cambodian national flag but there's much more to Angkor and the Khmer civilisation than its temples.

Photo: Angkor Wat temple complex. (SERENA/Gamma-Rapho via Getty Images)

The myths that have grown up around Cleopatra since her eventful reign in the first century BCE are so vivid and alluring that they seem to have taken on a life of their own. The Egyptian queen has been portrayed in art and literature as a wily temptress whose devastating beauty seduced two of Rome’s most powerful men, or as a ruthless killer who murdered her own relatives to get ahead, or as a tragic lover who took her own life using the bite from a poisonous snake. But how much of this is actually based on historical fact? There is evidence that Queen Cleopatra was in fact a clever stateswoman and scholar, who spoke multiple languages and successfully governed Egypt for over 20 years, becoming one of the most powerful female rulers in the ancient world.

Bridget Kendall unpicks fact from fiction with Joyce Tyldesley, reader in Egyptology at the University of Manchester; Maria Wyke, professor of Latin at University College, London; and Christian Greco, director of the Museo Egizio (Egyptian Museum) in Turin, Italy.

Image: Cleopatra on papyrus (DeAgostini/Getty Images)

The Austrian satirical writer Karl Kraus used his forensic pen to expose the Hapsburg Empire and 20th century Vienna for its dishonesty and decay. He was the master of the punchy one liner, as well as being extremely prolific: his magazine Die Fackel ran to 922 editions, that's some 22 thousand pages, and Kraus wrote most of them.

Rajan Datar talks about Kraus with Dr. Katharina Prager from the Ludwig Boltzmann Institute for History and Society, Dr. Simon Ganahl from the Austrian Academy of Sciences, both in Vienna, and Germanist Dr. Ari Linden from the University of Kansas.

Photo: Karl Kraus (Imagno/Getty Images)

We probably know ‘cool’ when we see it, but what lies behind it and where did it originate?

Most scholars agree that cool is a mode of being, an attitude or aesthetic. Some argue it arose out of a West African mode of performance, and was later developed in jazz circles by African-American musicians. Cool served to hide one’s emotions and survive confrontation with any hostile external forces – namely racism. In post-World War Two America, cool took on a new meaning, especially when its ideas were translated to white popular culture. It symbolised an individual’s rebellion, and new icons of cool emerged (especially on the silver screen) onto which people projected their deepest desires and fears.

Today cool is a commodity, taken up by global brands and in some ways divorced from its rebellious roots. Bridget Kendall is joined by three cultural historians to explore the multiple meanings and emergence of cool, including Joel Dinerstein from Tulane University in New Orleans, US, Claudia Springer from Framingham State University in Massachusetts, and Carol Tulloch from Chelsea College of Arts in London.

(Photo: American jazz musician Miles Davis. Credit: Jack Vartoogian/Getty Images)

Frida Kahlo, the iconic and flamboyant Mexican painter, is one of the most famous female artists of our age. Her rebellious and subversive works are instantly recognisable. Many are self-portraits depicting an arresting dark and heavy-browed woman, often in bright traditional Mexican dress with flowers woven into her hair, staring straight out of the canvas.

In her life time, she was better known as the wife of her celebrated artist husband, Diego Rivera. Now, she is arguably more famous than him, and her paintings sell for millions of dollars. Having lived and documented a life filled with physical and emotional pain, her blisteringly personal and political accounts now speak to populations young and old the world over. Bridget Kendall discusses her life, work and posthumous success with Kahlo experts Circe Henestrosa, Gannit Ankori, and Oriana Baddeley.

(Photo: Frida Kahlo. Credit: Ivan Dmitri/Michael Ochs Archives/Getty Images)

Quentin Cooper and guests follow the twists and turns of jet engine development: from its 1930s origins and the often highly dangerous early fighters in World War 2, through Korea, Vietnam and the Cold War, to the much more reliable modern incarnations which now take us all over the world.

Photo: close-up of a jet engine. (Getty Images/Dushlik)

Edgar Allan Poe is a 19th century American writer whose spine-chilling gothic tales have inspired generations of horror and mystery fiction writers. His poem ‘The Raven’, and short stories such as ‘The Fall of the House of Usher’ and ‘The Pit and the Pendulum’ brought him international fame, and he is also thought to have invented the detective fiction genre with ‘The Murders in the Rue Morgue’. But his tumultuous life was beset by personal tragedy, poverty and artistic struggle which seemed to echo many of the dark themes in his work.

Bridget Kendall explores Poe’s life and extraordinary work with J. Gerald Kennedy, Boyd Professor of English at Louisiana State University; Diane Roberts, Professor of English and Creative Writing at Florida State University; and Paul Collins, Professor of English at Portland State University.

Photo: Edgar Allan Poe (Corbis/Getty Images)