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Experts unveil 'cloak of silence'
Scientists show off the blueprint for an "acoustic cloak", which could make objects impervious to sound.
Ref. https://news.bbc.co.uk/1/hi/sci/tech/7450321.stm
I think this will be interesting as the military has already came up with a amplified sound emitter that makes people want to leave an area of effect thus making it something useful in riot situations or in war time. Is this the answer to it making other troops invisable to the sound attacks?