When the Philadelphia School District unveiled a plan to bring students back into the classroom part time this fall, the backlash from parents and teachers was swift. One week later, the district abruptly changed course and said school would happen entirely online until almost Thanksgiving. WHYY education reporter Avi Wolfman-Arent explains the flip comes down to just how tough it is to navigate the risks of COVID-19 and disrupting the education of tens of thousands of children.