Why Do We Make Lists?

The Why Factor - A podcast by BBC World Service

Lists of things to do and things to buy. Presents we want for Christmas, or things we desire in a lover. Lists help us organise our thoughts and bring order to a confusing world. But what do they reveal about us? (Photo: An original Madonna handwriten 1990 'to do' diary. Credit: Henry S. Dziekan III/Getty Images)