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Margaret Rayman, professor of nutritional medicine at Surrey University, explores why iodine is essential for our health. Show more
How a discovery in boiled urine led to the trade union movement and chemical weapons. Chemist Professor Andrea Sella tells the story of the element phosphorus. Show more
Uta Frith, Emeritus Professor of Cognitive Development at University College London, on the impact of the use and abuse of lead on humanity, from the iron age to the present day. Show more
