It was Read Across America week, and the second graders in the Hinds County School District in Mississippi were waiting for an administrator to read to them. The administrator had forgotten it was her turn, said Toby Price, the assistant principal at Gary Road Elementary School in Hinds County, who was in his office at the time. He decided to fill in. Mr. Price, 46, quickly grabbed a book — “I Need a New Butt!” by Dawn McMillan, one of his children’s favorites — and began reading it to the roughly 240 second graders over Zoom. Later that day, on...