Historian Alun Withey says beards can shed light on a whole range of things from medicine to the military. Pogonotomy - or the art of shaving - is about more than fashion. Recorded in front of an audience at BBC Radio 3's Free Thinking Festival of Ideas at Sage, Gateshead. New Generation Thinkers is a scheme run by BBC Radio 3 and the AHRC to find the brightest academic minds with the potential to turn their ideas into broadcasts.