5/5 Aleks Krotoski tells the story of how GPS helped navigation in the first Gulf War.
Martha Kearney reviews the release of secret government files from 1986.
Christopher Clark explores the entangling of empires in the First World War.
5/5 Why a landmark building in Oban by John Stewart McCaig never got finished.
BBC Radio 4 Extra
4/5 How the teashop and cake company Lyons built the first business computer in the 1950s.
3/5 How Our World became the first programme to link the globe by satellite in June 1967.
2/5 How Paul Robeson used the transatlantic telephone cable to sing live to British fans.
1/5 Aleks Krotoski reveals how telephone exchanges changed young women's working lives.
4/5 Jonathan Glancey finds out about 17th-century plans for a sumptuous palace in Whitehall.
Melvyn Bragg and guests discuss the story of Tristan and Iseult.