The BBC's James Gallagher investigates the invisible killer all around us.

Open source software is worth trillions to the economy. However, researchers warn that companies contribute too little to the development of open source tools.

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Since its invention, the form factor of the airplane has been bird-based; both airplanes and birds remain aloft by having appreciable wingspans. And in broad strokes, the overall form of the airplane hasn't changed much in the past 100 years. Helicopters…