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Lamp Phone, now even your light bulbs make it easy to ease drop on you!
https://techxplore.com/news/2020-06-bulb-vibrations-yield-eavesdropping.html
@freemo that was my first thought. Ot is very interesting. Pherhaps, one day will try it with my neighbours.
Thank you!
@mikelga From what I can tell it is measures by fluctuations in the brightness of the bulb.
Doppler shift of light would be imperceptible at those speeds.