'Ultrasound tube' levitates matter from one end to the other
If the Incredible Hulk were ever unleashed in the real world, guns and bombs would have absolutely no chance against him. Going by the 2008 movie, one of the few things that managed to hold the green giant back was sonic cannons that pinned him down with powerful sound waves. Scientists at the University of Helsinki, in collaboration with researchers from the Public University of Navarre and the University of Michigan, have now demonstrated a semblance of the technology behind that concept, with an ultrasonic tube that can physically confine and guide matter through the air.
The invisible, massless tube, made of nothing but ultrasonic sound waves from 256 miniature speakers, can guide liquids, gases, powders, and even plasma, making it look as though the substances are floating through thin air. Interestingly, everything happens without any audible sound. Changing the flow direction is as simple as reshaping the invisible tube...
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