Cell phones that can identify you by how you walk. Fingerprint scanners that work from 25 feet away. Radars that pick up your heartbeat from behind concrete walls. Algorithms that can tell identical twins apart. Eyebrows and earlobes that give you away.
A new generation of technologies is emerging that can identify you by your physiology. And unlike the old crop of biometric systems, you don't need to be right up close to the scanner in order to be identified. If they work as advertised, they may be able to identify you without you ever knowing you've been spotted.
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