This week, NBC News correspondent Heidi Przybyla tweeted a report about COVID-19 cases among public school students in Michigan. Her gloss implied that the data had just come out and that they revealed something important about the benefits of requiring students to wear face masks: “NEW: Virus spread was 62% higher in school districts without mask rules.”
The story that Przybyla cited was not actually “NEW.” It was published on October 15 by WJRT, the ABC station in Flint…
