China High Tech Expo

Visitors look at a display of electronic facial-recognition technology that claims to be able to detect when students are talking or looking at their cellphones at the 21st China Beijing International High-tech Expo in Beijing, China, Friday, May 18, 2018. The annual expo is a showcase of China’s state-of-the-art technologies and cutting-edge ideas. (AP Photo/Mark Schiefelbein)

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