Researchers have demonstrated it's possible to silence noise using an open, ringlike structure, created to mathematically perfect specifications, for cutting out sounds while maintaining airflow.
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2019/03/190307103109.htm
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2019/03/190307103109.htm
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