2008, Hungary: a researcher stands on a factory floor quizzing a bemused employee. The tile manufacturing company is in trouble, and the researcher is there to help. But his questions seem silly: Who do you go to for advice? Who do you chat to? What use is the science of networks to a company producing floor tiles? Hannah Fry tells a tale about the precarious power of networks. Presenter: Hannah Fry Executive Producer: Martin Smith Series Producer: Lauren Armstrong-Carter Episode Producer: Ilan Goodman A series for Radio 4 by BBC Science in Cardiff.