“FIVE FREEDOMS” – NEWS FEED: How Underground Fiber Optics Spy on Humans Moving Above
![](https://dailyclout.io/wp-content/uploads/Dc.5F-WiredCableSpying.20210723.jpg)
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.
READ Matt Simon’s article in Wired