@chainleft
wifi signals detecting your movement through walls without cameras
keystroke cadence identifying you faster than a fingerprint
your phone's accelerometer logging your gait so precisely it knows which leg you favor
ultrasonic beacons in retail stores pairing your devices to your physical location
license plate readers logging 99% of urban driving routes within 24 hours
behavioral biometrics scoring how you hold your phone to decide if you're you
and these are just the ones with published white papers
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