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Water drops bounce into action What happens if you let a drop of water fall gently onto a water-repelling surface? Physicists in France and the Netherlands who tried the experiment were surprised by what they saw. They found that a violent, ultra-fine jet of water emerges from the drop, moving at up to 40 times the drop's initial impact speed. The researchers believe the unusual behaviour is caused by the collapse of an air cavity that is created when the drop deforms as it hits the surface.
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