Erica Green of the New York Times writes today that the federal government has finally offered directions for schools faced with the global pandemic:

WASHINGTON — The Centers for Disease Control and Prevention advised schools on Friday that closings for at least eight weeks might be the most effective way to contain the coronavirus. The Education Department released school districts from a slew of testing and accountability measures required by federal law.

But schools across the country were far ahead of the Trump administration’s advice. A cascade of public school closings gained speed nationwide on Friday, with the largest school district in California, the Los Angeles Unified School District, announcing it was closing, along with the San Diego Unified School District. They joined other large cities like Washington, Miami and Seattle, and more than a dozen states like Virginia, Ohio, Maryland, Pennsylvania, Oregon, New Mexico and Michigan.

At least 21,000…