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    There was a similar story a couple of years before, where they did almost the same with vibrations on other objects https://arstechnica.com/science/2014/08/researchers-reconstruct-human-speech-by-recording-a-potato-chip-bag/

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      For those who find this interesting: over the last few years there has been some very interesting security research on these advanced exfiltration techniques. Here’s an example with fax:


      Here’s another one from the same school as the original article: https://www.securityweek.com/stealthy-data-exfiltration-possible-headphones-speakers

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        I’ve often wondered if high-powered telescopes could see places in a room out of the line of sight by focusing on an internal reflection at a boundary between crystals within a glass windowpane.

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          Continues to show that metadata just takes a while longer, but you still get the data eventually.