Terrorists and enemy insurgents are difficult to identify because they often conceal their faces with scarves and masks. A new algorithm has shown surprising promise being able to identify individuals by their characteristic “V for victory” signs.

Fingerprints used to be the cutting edge of biometric profiling, but this field has expanded significantly over the years. Today, people can be identified according to the unique shape of their bodies, including ears, eyes, nose—and even the shape of their ass. It’s also possible to glean a person’s identity based on the quality of their voice and the manner in which they walk.

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