When you scream, sound vibrations transfer energy in the form of waves. Talking is sending waves at different pitches that ears "feel" and interpret as talking. Some sounds are too high to be heard by human ears, but it still sends energy around. Otherwise, the sound doesn't exist. The U.S Department of Energy took sound energy a bit further and created a machine that produces sound waves at such a frequency (22 kilohertz) from opposite directions that it mimicked microgravity conditions (Micro gravity is a term to express an area that has just above no gravity) and made water float in mid air. The only downside to using waves is that water can only be placed at the nodes of the waves, otherwise it doesn't quite work out well.
Why make an expensive device that holds water? Because the device is great at making efficient medicine! It makes medicine more efficient by evening out the different substances into a chemical mixture. In other words, its the World's Best Test Tube.
For more information, click the link: http://www.dogonews.com/2012/9/17/levitate-water-harry-potter-style-no-wand-or-spell-needed
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