Public University of Navarra

If the Incredible Hulk ever came to the real world, the only thing that could hold him, going by the movies, is a sonic cage. Scientists have shown a similar concept with an ultrasonic tube that can physically hold and guide matter through the air.

Electricity is chaotic, and we normally need to constrain it to wires and circuits to make use of it. Scientists in Europe and Canada have now managed to guide sparks through thin air and even around obstacles using ultrasound waves.