“In the twenty-first century, the face is a database, a dynamic bank of information points—muscle configurations, childhood scars, barely perceptible flares of the nostril—that together speak to what you feel and who you are. Facial-recognition technology is being tested in airports around the world, matching camera footage against visa photos. Churches use it to document worshipper attendance. China has gone all in on the technology, employing it to identify jaywalkers, offer menu suggestions at KFC, and prevent the theft of toilet paper from public restrooms.”