Millions of us use this gesture but where does this everyday ritual come from?
BBC World Service Online
11/15 German writer Jakob Arjouni's Turkish sleuth, Kemal Kayankaya, reflects a reunited Germany
BBC Radio 4
1/15 How clothes symbolised power, philosophy, taste, sexuality and personal expression.
BBC Radio 4 Extra
Mike Thomson discovers how close Britain's greatest cold war secret was to being exposed.
Tuesday 6 November 2012