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3D Printed Acoustic Holograms: Totally Cool, Not Totally Useless

If you wave your hand under the water’s surface, you get a pattern of ripples on the surface shortly thereafter. Now imagine working that backwards: you want to produce particular ripples on the surface, so how do you wiggle around the water molecules underneath? That’s the project that a crew from the University of Navarre in Spain undertook. Working backwards from the desired surface waves to the excitation underwater is “just” a matter of math and physics.
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