Many students of psychology, business, nursing and other disciplines are taught about "Maslow's pyramid of human needs", a diagram that shows a progression from our basic needs, such as food and shelter, to higher, social needs and, eventually, to striving for often intangible life goals and fulfilment. The pyramid is an iconic image, yet Abraham Maslow, a leading humanistic psychologist of the 20th century, didn't actually create it. Moreover, his writings are much more sophisticated and perceptive than the diagram suggests. So where did this confusion come from and why didn't Maslow disown the pyramid? How should we understand Maslow's hierarchy of human needs? Why has it proved so useful in so many different disciplines? And in what way is it relevant to how we live today?

These are some of the questions that Bridget Kendall explores with Jessica Grogan from University of Texas at Austin, author of Encountering America, a history of humanistic psychology; David Baker, emeritus professor of psychology and former director of the Cummings Center for the History of Psychology at the University of Akron; and Scott Barry Kaufman, former director of the Imagination Institute at the University of Pennsylvania and author of Transcend which updates Maslow for the 21st century.

[Photo: Abraham Maslow, undated photograph. Credit: Bettmann/Getty Images]

When the Kalevala was published in 1835, Finland had a distinct cultural and linguistic identity but it had always been part of either the Swedish or the Russian empire. Neither did Finland have much of a literary tradition, but as the 19th-century progressed the Kalevala took on a symbolic role as the representation of a Finnish identity that fed into the movement for Finnish independence. Rooted in the folk culture of the Karelia region, a travelling doctor shaped the song texts into a story in a way which is still being debated today.

Joining Bridget Kendall to discuss how the Kalevala underscored the search for Finnish national identity are Dr Niina Hämäläinen, executive director of the Kalevala Society in Helsinki; Professor Tom DuBois from the University of Wisconsin-Madison, the author of Finnish Folk Poetry and the Kalevala; and the award-winning British musician, playwright and storyteller, Nick Hennessey.

Produced by Fiona Clampin for the BBC World Service.

[Image: The Defense of the Sampo, 1896. Artist: Akseli Gallen-Kallela. Credit: Fine Art Images/Heritage Images/Getty Images]

Sister Juana Ines de la Cruz is celebrated today as one of the finest poets in the history of Mexico. She was not just a creative and intellectual force but also a campaigner for women’s education and someone not afraid to challenge male hypocrisy. The colonial 17th-century society in which she lived was very patriarchal so, not surprisingly, her views brought her into conflict with the men in power.

Rajan Datar looks at key episodes in Sister Juana’s life and examines the passion and ingenuity in her poetry and plays with the help of Alicia Gaspar de Alba, Professor at University of California Los Angeles and a writer whose novels include Sor Juana’s Second Dream; Dr. Amy Fuller, Senior Lecturer at Nottingham Trent University, specialist in early modern Spain and Mexico and author of Between Two Worlds, a monograph on Sister Juana's plays; and Rosa Perelmuter, Professor of Romance Studies at University of North Carolina at Chapel Hill. The reader is Pepa Duarte.

[Image: A painting of Sister Juana by the Mexican artist Miguel Cabrera (1695-1768). Credit: DeAgostini/Getty Images]

We delve into the watery depths of sea creature folklore, with a round-the-world tour of different variations on the concept of mermaids – from the Sirens of Greek mythology to the Selkies or Seal Folk of Scottish legend, and water spirits known as Mami Water, which are venerated in parts of Africa and the Americas. Not forgetting the famous fairy tale, The Little Mermaid, which has captivated the imagination ever since its publication in 1837 and was popularised by Disney in the 1980s.

Joining Bridget Kendall to discuss what these ancient stories can tell us are Cristina Bacchilega of the University of Hawaii, co-editor of The Penguin Book of Mermaids; British writer, Marcelle Mateki Akita, who has written a book for children called Fatama and Mami Wata's Secret; and Lynn Barbour, founder and Arts Director of the Orkney Folklore and Storytelling Centre in the Orkney Islands in Scotland.

Produced by Jo Impey for the BBC World Service.

[Image: Detail from Fisherman and Mermaids in the Blue Grotto on Capri by Hermann Corrodi (1844-1905). Credit: Fine Art Images/Heritage Images/Getty Images]

In ancient Greece, thousands of people flocked each year to join the religious rites known as the Eleusinian Mysteries. Based on the cult of the goddess of fertility Demeter and her daughter Persephone, the Mysteries were for many a profoundly moving and life-changing experience. People from all over the Greek world and beyond travelled to Eleusis for at least 800 years and the ceremonies remained a highlight of the Athenian calendar throughout that time. But what really went on in the great hall of the sanctuary at Eleusis? Why did the organisers deem it necessary to issue a strict injunction against divulging what actually took place - and what happened to some of those who broke that rule?

These are some of the questions Bridget Kendall discusses with Christy Constantakopoulou, professor in ancient history and classics at Birkbeck College, London; Esther Eidinow, professor of ancient history at Bristol University; Dr. Philippe Michel Matthey who lectures about ancient religions at Geneva University; and Dr. Julietta Steinhauer, a lecturer in Hellenistic history at University College, London.

[Image: Detail from a vessel showing a scene of the Eleusis cult with Triptolemus in a winged chariot and Demeter, c.460 BC. Credit DeAgostini/Getty Images]

Late 18th-Century Saint Domingue in the Caribbean – now known as Haiti – was one of the richest countries in the world. Known as ‘the pearl of the Antilles’, its wealth was built almost entirely on slavery. Around half a million enslaved Africans were transported to the French colony to work on the sugar plantations.

Toussaint L’Ouverture was destined to see out his days within this brutal system, but his skills as a negotiator and communicator saw him rise to the forefront of the resistance movement on the island. A wily and charismatic operator, he galvanised his fellow countrymen and women to lead history’s first and only successful slave uprising.

Diverging from French colonial rule brought him to the attention of Napoleon Bonaparte, who sent a large fleet to re-establish slavery on Saint Domingue. The expedition ended with Toussaint’s capture and exile to France, where he died in a cold prison cell in 1803. But his generals meanwhile carried on the struggle to uphold Toussaint’s opposition to slavery, which became the basis for the new independent state of Haiti.

Joining Rajan Datar to explore this complex figure are Marlene L Daut, Professor of African Diaspora Studies in the Carter G. Woodson Institute at the University of Virginia, and the author of Tropics of Haiti: Race and the Literary History of the Haitian Revolution in the Atlantic World, 1789-1865; Weibert Arthus, the Haitian ambassador to Canada, who’s also published widely on Haitian diplomacy and history; and Sudhir Hazareesingh, professor in politics at Balliol College, Oxford. His biography Black Spartacus: The epic life of Toussaint Louverture was published in 2020.

Producer: Fiona Clampin

(Image: Toussaint L'Ouverture painted on the body of a tap-tap bus operating in Port-au-Prince, Haiti. Credit: Jan Sochor/Getty Images)

She fought to give women the right to divorce and campaigned on behalf of children born out of wedlock. But in late 18th century France, her radical thinking proved too much for her contemporaries in the French revolution. She insisted women should be allowed to speak out, and she was executed at the guillotine for doing just that. For nearly two centuries her story was largely forgotten, until she was championed by modern-day French feminists, who called for her to be given pride of place in the pantheon of France’s national heroes.

Joining Bridget Kendall to discuss the life of the French political activist and playwright Olympe de Gouges are: French philosopher of feminist thought, Geneviève Fraisse; Professor Catriona Seth of the University of Oxford; and British-French playwright and translator, Clarissa Palmer.

Produced by Jo Impey for the BBC World Service.

Image: Portrait of Olympe de Gouges (1748-1793) by Anonymous

When Alexandre Yersin discovered one of the most lethal bacteria in human history, the tiny bacillus of the plague that over the centuries had killed tens of millions of people, he earned his place in the history books. Working in a straw hut in Hong Kong, armed with just a microscope, Yersin’s methodical mind worked out within just a few days where in human body to look for the plague bacteria. A much bigger and better-equipped Japanese team, competing with Yersin, came away empty-handed. So who was Alexandre Yersin? Why did this pioneering Swiss scientist spend most of his life in Vietnam? And why did it take decades fully to credit Yersin with the discovery of the microorganism that now bears his name, Yersinia pestis?

These are some of the questions Bridget Kendall discusses with film director Stephane Kleeb, who made a documentary about Yersin; Professor Maxime Schwartz, medical historian and former director of the Pasteur Institute in France; and Dr. Mary Augusta Brazelton from Cambridge University whose research focuses on medical history of Asia.

[Image: Alexandre Yersin in a sailor's uniform, c.1890. Credit: Pascal Deloche/Godong/Universal Images Group via Getty Images]

There have been so many, probably hundreds, different styles and types of hat in history that a question inevitably arises: why? Why did something that began as a simple protection against inclement weather take on such varied forms and social meanings? Bridget Kendall and guests explore not just how hats were made, and by whom, but also how their function has evolved over centuries and across cultures. By focusing on just five distinct hat types, they sketch out a brief social history of headwear.

Bridget is joined by Dr. Drake Stutesman, an adjunct professor at New York University, and the author of the book Hat: Origins, Language, Style; Dr. Ulinka Rublack, professor of Early Modern European History at Cambridge University with a particular interest in Renaissance fashion; and Dr. Kirill Babaev, a cultural anthropologist and writer from the Russian Academy of Sciences and founder of the World of Hat museum in Riga, Latvia.

[Image: Model Carre Otis wearing a wide-brimmed black straw hat with a print of lemons on the underside. Credit: Arthur Elgort/Conde Nast via Getty Images]

Azerbaijan’s strategic location along the old Silk Road and its wealth of natural resources has made it a prime target for warring empires over centuries. The conquests and the invasions by Turkic and Persian peoples find echoes in the traditional art music of Azerbaijan known as mugham. The influence of the Russian and then Soviet empire also brought change for mugham, the effects of which are still debated today.

Mugham is characterised by a large degree of improvisation, but musicians learn for years from mugham masters to acquire the skills which allow them to extemporise within a strict framework. It’s no surprise to learn that in the 20th century, mugham fused with that other great improvisatory music – jazz. With the help of musical examples, Rajan Datar and guests will explore how mugham works and the instruments such as the tar and the kamancha that give this music its unique sound.

Joining Rajan will be ethnomusicologist and tar player Dr Polina Dessiatnitchenko who’s writing a book on mugham in post-Soviet Azerbaijan; Jeffrey Werbock, musician and chair of the Mugham Society of America; and music producer and artistic patron Nasib Piriyev, who set up BUTA Arts, an organisation designed to raise awareness of Azeri music and culture.

Produced by Fiona Clampin for BBC World Service.

Image: Alim Qasimov sings an improvised Mugham during the Opening Ceremony for the Baku 2015 European Games