Dr. Høeg talks about her research tracking case rates at two paired school districts in the same community, each with 12,000 students - one with a mask mandate and another with mask optional. She explains that Covid-19 rates at both districts have remained comparable and both rose during the Omicron surge. Recently the mask mandate district went mask-optional, with transmission actually falling. Over the course of the fall mask mandates didn't reduce transmission rates in the mask-mandated district.