Andrea Sella, Professor of Inorganic Chemistry at University College London, answers the big questions about Novichok. The deadly nerve agent killed Dawn Sturgess and poisoned many more in Salisbury and Amesbury in 2018. What is it, when was it developed, and what does it do to our bodies? This episode was made by Marie Lennon, Andy Howard, Tom Ryan & Dan O’Brien. Executive production by Mary Sanders and Naomi Wordley.