Well well well… looks like wearing masks doesn’t… oh wait—

📍NEW—Mask-wearing is the single most effective public health measure at tackling #COVID19, reducing incidence by 53%—the first global systematic review of 30 worldwide studies shows. #MaskUp https://t.co/mqQmrQIi8k

— Eric Feigl-Ding (@DrEricDing) November 19, 2021