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Sound-wave time crystal appears to defy Newton’s 3rd law in lab tests

Physicists at New York University have built a time crystal powered entirely by sound waves, and lab tests suggest the ...
Business Insider

Inside one of the strangest looking NASA test sites where sound goes to die

NASA's Aero-Acoustic Propulsion Lab is basically a graveyard for sound. Every surface inside is covered with 17,000 spiky wedges that absorb sound and prevent echoes. Nicknamed "The Dome", AAPL ...