Biometric systems—fingerprints, faces, irises—are built on biology so unique it's nearly flawless. But the engineering that follows is not. This episode unpacks the gap between the trait and the technology: how a single threshold dial trades false rejections against false acceptances, why that dial is a values choice, not a technical one, and how the same system that works seamlessly on your phone can generate cascading errors at scale. The hosts examine demographic disparities in face recognition, the crucial distinction between one-to-one verification and one-to-many surveillance, and why your face, unlike a password, cannot be reset.
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