XPost: misc.news.internet.discuss   
   From: dannyb@panix.com   
      
   In  JAB  writes:   
      
   >Eavesdropping on Sound Using Variations in Light Bulbs   
      
   >New research is able to recover sound waves in a room by observing   
   >minute changes in the room's light bulbs. This technique works from a   
   >distance, even from a building across the street through a window   
      
   >https://www.schneier.com/blog/archives/2020/06/eavesdropping_o_9.html   
      
   Russkies were doing this with microwave reflectors on the US Embassy   
   decades ago.   
      
      
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