Judith Moore, a mathematics professor at the College of Southern Maryland, was overseeing a test last term in the way it’s done these days. She kept an eye on the images of her students on her screen as the cameras on their computers showed them taking the tests from kitchen tables and bedrooms of wherever they happened to be. But she noticed one woman who appeared to be in distress. "She kept putting her face in her hands," said Moore. "She had this look of intense frustration, like...


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