David R. Henderson and Ryan Sullivan:

Tens of millions of students started the school year completely online, including those in 13 of the 15 largest school districts in the U.S. The primary reason is concern over safety for students and staff. But recent data are shifting the discussion on school safety and infection rates of Covid-19. They argue strongly for opening K-12 schools.

Previous evidence has suggested that schools are not superspreaders. That research came from other countries (whose rates and environments are different) or very specific cases in America, such as YMCA summer camps. While this suggested little impact on infection rates from opening the schools, it was possible that the unique environment of U.S. public schools would cause different outcomes.