Lynne Truss examines the revolutionary impact of everyday objects. 2: The Zip. It has an ingenious arrangement of teeth which keeps the draught out and our money secured, and it can convert any man into a boy soprano in a trice. It is indeed a brilliant invention - except when it breaks. Lynne Truss looks at the history of the zip from its conception in 1893 to the present day with the help of inventor James Dyson and writer Sarah Dunant. producer Erika Wright