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How Underground Fiber Optics Spy on Humans Moving Above
Monday June 28, 2021. 06:00 PM , from Wired: Cult of Mac
Vibrations from cars and pedestrians create unique signals in cables. Now scientists have used the trick to show how Covid-19 brought life to a halt.
https://www.wired.com/story/how-underground-fiber-optics-spy-on-humans-moving-above
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