This just in:
We here in Norway are at the cutting edge of science. The most recent invention to see the light of day is the EZTuner. It is a device you put over your ears, wich enables you to filter out annoying sounds in your surroundings without eliminating all sound.
The device utilizes anti-sound principles first reasearched in connection with highway noise and ways to counter it.
An experiment with human voices showed remarkable results. On the EZTuner there are presets that can be programmed to desired frequencies. A person (A) started talking in a crowded street, and after person B activated the EZTuner all background noise was eliminated, and you could hear person A as if in a silent room.
Now something funny happened. Person B reversed the EZTuner, and now as person A was talking loudly into his ear no sound reached it. He could hear the busy hum of the street, but person A was inaudible.
I don't know about you, but I'm getting one.