What does a volcanologist know about volcanoes? Hear Steve Sparks FRS in conversation with Jim Al-Khalili about a fascinating career studying one of the most dynamic phenomena on earth - volcanoes. Find out more about the event filmed at the Royal Society, London on 28 September 2015. royalsociety.org/events/2015/09/volcanoes-and-us/ Image: Sarychev Peak Volcano erupts on Matua Island. Image credit: flickr.com/John CC BY-SA 2.0