COVID-19 restrictions have damaged children developmentally in ways that might be irreparable, teachers say. From early childhood to high school, children rely on facial expressions, social interaction, conversation with new people, and friendships to develop mentally. Children denied social interaction don’t grow mentally in the same way. When governments closed in-person schooling for months, cracked down on activities like play dates, and ordered families to stay home it plunged children into painful isolation. Now, teachers across America say the lockdown generation lags behind those raised in normal years. Older children have fewer friends and slower minds, while some of the...