China is building the world’s most powerful facial recognition system to identify any one of its 1.3b citizens within 3 seconds. The goal is for the system to able to match someone’s face to their ID photo with 90% accuracy. However, the project is encountering “many difficulties” due to the technical limits of facial recognition and the sheer size of the database involved. Some totally unrelated people in China have faces so alike that even their parents cannot tell them apart.

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