....Masks, in addition to vaccines, work. Lots of evidence in favor of masks has accumulated during the pandemic, but nothing quite like a new randomized trial that involved more than 340,000 adults in Bangladesh, some of whom were given masks and told to wear them. The groups that wore masks in this massive study had fewer symptomatic cases. “Anti-mask people keep saying, ‘Where’s the randomized controlled trial?’ Well, here you go,” as one doctor told me....