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HSS could be used to make laptop speakers that blare music to the person in front of the screen, while no one else could hear it. It could allow a grocery store to play audio advertisements that seem to come from, say, the display of Duracell batteries, yet the ad could be heard only by the shopper in front of the display. An HSS-equipped car could play one CD for the parents up front and another for kids in the back. Neither would hear even a whisper of the others' music.
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I never imagined something like this would happen. I can't wait till it is adopted into mainstream society.
Even though its old, I thought it was cool