A trio of new studies describe the effects of the COVID-19 pandemic on public school students and staff, one finding that a quarter of children and teens in Chicago schools were stressed after school closures and the implementation of distance learning, another showing that coronavirus cases were elevated in schools that took few or no mitigation measures, and the last concluding that in-person learning in New York City public schools wasn't tied to increased viral infections.Loneliness, anger, anxiety, depressionThe first study, led by researchers from Children's Hospital of Chicago and published yesterday in JAMA Network Open, consisted of an anonymous survey of 32,217 caregivers of Chicago public school students 3 or 4 months after the