Air-ventilation upgrades have been badly needed in U.S. classroooms since long before the pandemic. Low-tech filtration systems that cost about the same as a textbook per student can make a big difference.

Harvard Chan School’s Joseph Allen gives America an “F” on school reopening efforts, and says we’re in danger of losing thousands of virtual dropouts and wasting mild late summer/early autumn weather we could use to boost in-person learning.

A new Harvard course challenges students to use science to evaluate COVID-19 policies.