Atlas wrote in a tweet, “Masks work? NO” followed by a series of misrepresentations about the science behind the effectiveness of masks in combating the pandemic. The tweet links to an article in the American Institute for Economic Research that argues against the effectiveness of masks, among other things.

The message pushed by the controversial neuroradiologist goes against guidance from the US Centers for Disease Control and Prevention, which recommends people wear masks in public settings and when around people who don’t live in their household, especially when other social distancing measures are difficult to maintain…

In all, the US reported more than 69,100 new Covid-19 infections Friday — the most in a single day since about 71,300 were reported on July 29, according to Johns Hopkins University data.