How are schools deciding to close due to COVID-19 cases? It all depends.
Health experts said creating broad rules that can apply to every school — or even every class within a school — is difficult.
Kindergarteners wait to start their first day of school on Aug. 31 at Powel SLAMS, a K-8 school at N. 36th and Warren in Philadelphia.Read moreALEJANDRO A. ALVAREZ / Staff Photographer
