They were the ancient horse lords of the Eurasian steppe, nomadic warriors whose influence extended over thousands of kilometres from Mongolia to the Ukraine. The spectacular gold jewellery and mummified remains preserved in their ancient burial mounds, some the size of a football pitch, tell us they loved colour and precious metal. But what else do we know about the enigmatic Scythians? They left us no written records so we have to rely on testimonies of their neighbours and new archaeological and genetic techniques. One thing seems sure, they knew how to party. Not only do Greek sources repeatedly mention ‘drunken Scythians’ but archaeological evidence confirms feast remnants with hundreds of wine amphorae and ‘purification tents’ filled with hemp smoke.Bridget Kendall is joined by leading experts on the Scythians: Professor Hermann Parzinger, president of the Prussian Cultural Heritage Foundation, Dr Margarita Gleba from the Ludwig Maximilian University of Munich and Sir Barry Cunliffe emeritus professor from Oxford University.(Photo: A traditional animal-like piece of ornament on display at an exhibition of the treasures of the ancient Scythian burial mounds in the Siberian Valley of the Kings, held at the Tuva Republic National Museum in Kyzyl (Credit: Artyom Geodakyan/TASS/Getty Images)

The Russian Civil war was a struggle for power at every level – from the villages to the imperial centre, with more than 11 foreign powers involved as well as nationalists, from Ukraine, Poland and the Baltic states, fighting for independence. This conflict, which took place a hundred years ago, between a small group of revolutionaries known as the Bolsheviks and their enemies was one of the most brutal and tragic periods in Russian history, but it was also to shape the new Soviet state that was founded in 1922, and still characterises Russia today. But why did events of the Russian Civil war end up crushing hopes for democracy after the idealism of the October revolution? And how did a small extremist group like the Bolsheviks manage to take control, despite resistance - not just from the upper and middle classes- but also from peasants and workers? Joining Bridget Kendall to explore these themes further is Laura Engelstein, Professor Emerita of Russian history and author of “Russia in Flames”; Steve Smith, Professor of History at Oxford University who wrote “Russia in Revolution”, and Dr Katya Rogatchevskaia, lead curator of the Russian and East European collections at the British Library in London. Image: Cossack Throws General Wrangel in the Black Sea (Poster). Private Collection. (Photo by Fine Art Images/Heritage Images/Getty Images)

Mention famous polar explorers to most people and they will probably come up with the names Scott and Amundsen. But really there should be another name before these, Fridtjof Nansen, a man who can be viewed as a true pioneer of intrepid, indeed death-defying expeditions to the freezing, bleak extremities of the world. He ventured closer than anyone else before him towards the North Pole but this Norwegian national hero was so much more than a character from a boys-own adventure annual. He was a scientist, an early oceanographer, a top class skier, a bestselling author, a diplomat, a humanitarian who spearheaded the repatriation of nearly half a million starving First World War prisoners, a tireless fundraiser for famine relief, the man who gave thousands of stateless people passports and a Nobel Peace prize winner. Rajan Datar recounts Nansen's remarkable life with the help of historians Robert Marc Friedman and Carl Emil Vogt, writer Marit Fosse and polar explorer Paul Rose.Picture: Explorer and humanitarian Fridtjof Nansen. Credit: The Print Collector/Getty Images

From the moment the seven-year-old Rudolf Nureyev saw a ballet on stage in his local theatre, he lived and breathed dance. That overwhelming desire to be on stage carried him throughout his life – from his student days in Leningrad to his defection to the West in a blaze of publicity, from theatres around the world to his final curtain in 1992 when his gaunt body was ravaged by Aids. He made good on his promise: “the main thing is dancing, and before it withers away from my body, I will keep dancing till the last moment, the last drop.”In a career spanning more than three decades, he brought new audiences to ballet, and gave new meaning to the role of male dancers. He was a pin-up, a performer whose stage presence and artistry was so mesmerising that those who saw him perform in the 1960s have never forgotten the experience. His leaps defied gravity; he gave the impression of floating through the air. But his demands for perfection could make him a difficult person to be with. His temper was as legendary as his dancing. Bridget Kendall explores how Nureyev’s commitment to transcend his childhood in grinding poverty made him one of the world’s most celebrated dancers, with writer Julie Kavanagh, author of Rudolf Nureyev: The Life; writer and translator, Irina Klyagin, who looks after Harvard University’s extensive theatre collection and specialises in Russian ballet; and Thierry Fouquet, vice chair of the board of trustees of the Rudolf Nureyev Foundation who worked with Nureyev during his time at the Paris opera, the home of France’s leading ballet company.(Photo: Rudolf Nureyev In 'Aureole'. Credit: Linda Vartoogian/Getty Images)

John Harvey Kellogg is best known, along with his brother, for changing the way the world ate breakfast. But cornflakes were actually a by-product of Dr Kellogg’s lifelong mission to improve the dietary health of patients at his Battle Creek Sanitarium, a once world-famous medical centre and spa in the US state of Michigan that he ran from 1876 to 1943. Here Kellogg preached the art of ‘biologic living’: a healthy vegetable-based diet, avoiding alcohol, cigarettes, caffeine and meat, and getting plenty of exercise and fresh air. This was a revolutionary way of living at the time in the US, and Kellogg’s work influenced many of our current ideas about food and its relationship to bodily health, and the concept of ‘wellness’.Rajan Datar discusses John Harvey Kellogg’s life story with Howard Markel, Professor of the History of Medicine at the University of Michigan; Laura J. Miller, Professor of Sociology at Brandeis University in Massachusetts; and Brian C Wilson, Professor of Comparative Religion at Western Michigan University.Image: John Harvey Kellogg Credit: Library of Congress/Getty Images

Indigo: not only one of the seven colours of the rainbow and the dye that makes your jeans look like they do but and a highly valued pigment which is naturally found in some plants and whose use can be traced back at least six thousand years to Peru. Such was the desirability of indigo that along with sugar, cotton, coffee and tobacco it became a major driver for globalised trade and the horrors of slavery. In India it was the source of so much exploitation that a lawyer called Gandhi rose to fame standing up for indigo farmers. Rajan Datar explores the rich history of the dye with Jenny Balfour-Paul, an Honorary Research Fellow at Exeter University and author of Indigo: Egyptian Mummies to Blue Jeans; Lucille Junkere, an artist and textile researcher with a particular interest in the history of indigo in Nigeria and the Caribbean; and Andrea Sella, a professor of chemistry at University College London who delights his students with all kinds of colourful experiments with indigo.Photo: Detail of adire indigo cloth from Nigeria. Credit: Education Images/Universal Images Group via Getty Images

Domesticated cats are thought to have started living alongside humans more than 9000 years ago. Unlike dogs, it's believed cats domesticated themselves, entering the homes of early arable farmers in the Fertile Crescent to control the rodent population. Since then, they've been worshipped, vilified and revered by various societies around the world. Today, they are one of the world's most popular pets, living on every continent except Antarctica and a favourite on the internet, and yet, they will never have that image of loyalty that is associated with dogs.Rajan Datar welcomes three experts in science, culture and archaeology to discuss the history of the domesticated cat: Katharine Rogers - a Professor Emerita of English Literature from City University of New York and author of numerous books including 'Cat' and 'The Cat and the Human Imagination'; Eva-Maria Geigl - an Evolutionary geneticist at the French National Research Institute CNRS; and John Bradshaw - an anthrozoologist from Bristol University, UK, and author of the book 'Cat Sense'.Photo: Copy of wall painting from private tomb 52 of Nakht, Thebes (I, 1, 99-102) cat eating fish, 20th century Credit: Ashmolean Museum/Heritage Images/Getty Images

Manuela Sáenz was an Ecuadorian revolutionary who for many years was most famous for her role as the lover of Simón Bolívar - the Venezuelan military leader who secured independence from Spain for a number of countries in South America between 1819-1830. Sáenz left her British husband for Bolívar, or 'The Liberator' as he was known, and famously saved the leader from an assassination attempt, earning her the name 'Libertadora'. But Sáenz was a political force in her own right, receiving various honours for her work for the revolutionary cause. She continued her involvement in politics right to the end of her life while exiled in Peru, acting as a spy and creating a network of informants.As many countries in what used to be known as 'Gran Colombia' celebrate 200 years of independence from Spain, Bridget Kendall speaks to three experts about Manuela Sáenz's key role in the independence struggle: Pamela Murray, professor of history at the University of Alabama at Birmingham and author of the biography For Glory and Bolívar: The Remarkable Life of Manuela Sáenz; Matthew Brown, professor in Latin American history at the University of Bristol, UK; and Marcela Echeverri, associate professor at Yale University's Department of History in the United States.(Photo: Portrait of Manuela Sáenz in 1825 by Pedro Durante. Credit: Museo Nacional de Arqueología, Antropología e Historia del Perú)

The invention of the electric telegraph in the mid-19th century brought about a revolution in human communication that some argue rivals the printing press and the internet. Suddenly the ‘tyranny of distance’ could be overcome – messages that once might have taken days or even weeks to arrive could be sent almost instantly using Morse code signals. Soon wires reached across continents and under oceans, connecting the world as never before, and radically changing areas such as commerce, diplomacy, journalism and warfare forever.Bridget Kendall discusses the telegraph’s extraordinary impact with Roland Wenzlhuemer, Professor of Modern History at the University of Munich; Bruce J Hunt, Professor of History at the University of Texas; and Gillian Cookson, Historian of Engineering and Research Fellow at the University of Leeds.Photo: Old-fashioned telegraph pole in Rhineland, Germany Credit: bibi57/GettyImages

Made from the simple juice of the poppy, opium is arguably the oldest and most widely used drug in the world. Since prehistoric times it has been used to relieve physical pain and quieten troubled minds. It has enabled medical breakthroughs, and inspired some of the greatest Romantic poets and composers. But opium, and its later derivatives morphine and heroin, has also brought addiction and untold misery and death, destroyed families, and corrupted entire countries. Its trade has provoked wars, and is still making global headlines today, from its production in Afghanistan to the opioid crisis in the United States.Bridget Kendall explores opium’s long and complex history with Doris Buddenberg, former head of United Nations Office on Drugs and Crime in Afghanistan, and curator of a recent exhibition on opium; Zhou Xun, Reader of Modern History at the University of Essex; and Mike Jay, author and cultural historian, whose books on the history of drug use include ‘High Society’.Image: Opium poppy flower Credit: yamatao/Getty Images