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How to Block the Ultrasonic Signals You Didn't Know Were Tracking You

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Ultrasonic signals

Credit: Getty Images

Dystopian corporte surveillance threats today come at us from all directions. Companies offer "always-on" devices that listen for our voice commands, and marketers follow us around the web to create personalized user profiles so they can (maybe) show us ads we'll actually click.

From Wired
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