"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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Faltskog boarded a chartered jet, which previously belonged to millionaire aviator Howard Hughes, and flew straight into the middle of a tornado which forced Boston's airfield to close.

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