A while back the original post, Scientists Create a Real 'Cone of Silence', highlighted the advancement in sound mitigation by Steven Cummer, professor of electrical and computer engineering, and his colleagues at Duke University.
Jeremy Luscombe, of resonics.co.uk, wrote in to tell me about, "a more comprehensive look at future acoustic and soundproofing technologies."
Great progress is being made on many fronts, and Jeremy has written about seven of them. It is a fascinating read.
My favorite is the "Air Transparent Soundproof Window" (below).
While these technologies are being developed mainly for commercial use, the materials and techniques also have counterespionage potential.
