<iframe width="640" height="360" src="http://www.youtube.com/embed/669AcEBpds ... r_embedded" frameborder="0"></iframe>
The acoustic levitator uses two small speakers to generate sound waves at frequencies slightly above the audible range – roughly 22 kilohertz. When the top and bottom speakers are precisely aligned, they create two sets of sound waves that perfectly interfere with each other, setting up a phenomenon known as a standing wave.
¿Alguien se anima?