BBC News - Dr Who's sonic screwdriver 'invented' at Dundee University: The Dundee University researchers have created a machine which uses ultrasound to lift and rotate a rubber disc floating in a cylinder of water.
It is said to be the first time ultrasound waves have been used to turn objects rather than simply push them...
They used energy from an ultrasound array to form a beam that can both carry momentum to push away an object in its path and, by using a beam shaped like a helix or vortex, cause the object to rotate.
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