S. Naipaul, every tiny turbulence of dust betrays a peasant.

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They also conclude that greenhouse warming has partially been offset by the cooling effect of aerosols - tiny particles of dust thrown into the atmosphere that can reflect solar radiation back into space.

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"A dust-devil looks essentially like what you would expect from the movies - a tiny tornado that is lifting dust, " explained Manuel de la Torre Juarez of Nasa's Jet Propulsion Laboratory (JPL) and a scientist on the Rover Environmental Monitoring Station (Rems) instrument.

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In this dust they have found tiny iron rich spheres.

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Before people started making such a mess, the number of dust particles orbiting earth was tiny, since they would have been dragged quickly into the atmosphere by friction and burnt up.

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Each layer consists of an array of elements made of foil, which produce tiny electrical pulses whenever they are penetrated by specks of dust.

ECONOMIST: Orbital debris