Wearable technology

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How the fitness tracker became a million dollar idea
The BBC's Aaron Heslehurst explains how the fitness tracker became a million dollar idea.
Five tips to keep your app data safe online
After a fitness app "heatmap" revealed military information, what are your devices saying about you?
The hi-tech trousers inspired by Wallace and Gromit
Researchers inspired by a Wallace and Gromit film have developed trousers with artificial muscles.