Two years after an ash cloud created by the Eyjafjallajokull volcano caused travel chaos across Europe (Remember? Obama used it as an excuse to leg it early), Kate Humble travels to Iceland to learn how the country's scientists monitor and manage its most dangerous volcanos. She hears about some of the most notable eruptions in its history, including an 18th-century incident that killed thousands locally and has been linked to the deaths of many more people in Britain and Europe, and asks what can be done to prepare for similar events in the future. Eh, a really big fan?