The doctor who discovered how cholera spread

In the 1800s cholera was a mysterious disease killing millions around the world. No-one knew how to stop it till an English doctor, John Snow, began investigating the outbreak of 1854. At a time before germ theory was properly understood, many public health experts thought disease was carried on what they called "bad air". John Snow was alone in thinking cholera was spread through contaminated water and by the time of his death - in 1858 - his theories had still not been fully accepted. Claire Bowes spoke to Dr Nigel Paneth, a biographer of John Snow, about the skills he brought to the developing science of epidemiology.Photo: Portrait of John Snow (Science Photo Library BBC)

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Eye-witness accounts brought to life by archive. Witness History is for those fascinated by the past. We take you to the events that have shaped our world through the eyes of the people who were there. For nine minutes every day, we take you back in time and all over the world, to examine wars, coups, scientific discoveries, cultural moments and much more. Recent episodes explore everything from the death of Adolf Hitler, the first spacewalk and the making of the movie Jaws, to celebrity tortoise Lonesome George, the Kobe earthquake and the invention of superglue. We look at the lives of some of the most famous leaders, artists, scientists and personalities in history, including: Eva Peron – Argentina’s Evita; President Ronald Reagan and his famous ‘tear down this wall’ speech; Thomas Keneally on why he wrote Schindler’s List; and Jacques Derrida, France’s ‘rock star’ philosopher. You can learn all about fascinating and surprising stories, such as the civil rights swimming protest, the disastrous D-Day rehearsal, and the death of one of the world’s oldest languages.