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Foam result surprises scientists The flow of air over the wings of an aeroplane provides the lift that keeps it in the air. However, physicists in France have discovered that when a foam flows over an aerofoil, the resulting force is exerted downwards rather than upwards. The force - which the team calls anti-inertial lift - work could have implications in fields as diverse as oil extraction and industrial cleaning processes (Phys. Rev. Lett. 95 168303).
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