The Sound Dampening Metamaterial Cloak
Researchers at Duke University have developed... ...erforated plastic sheets that successfully dampen sound . The cloak is designed to prevent sound from traveling forward by guiding the sound waves through holes in the plastic sheets, thereb... ...microwaves they should b...
https://www.neatorama.com/2011/07/08/the-sound-dampening-metamaterial-cloak/
