Several new studies published this month support wearing masks to curb the transmission of the novel coronavirus. Face masks appear to be most effective when supplemented with hand-washing and physical distancing, Schünemann and his colleagues said. Other states have directed workers in restaurants and other businesses to wear masks, while recommending that residents follow suit. And more than three-quarters — including those people who wear masks ubiquitously — said they wear their masks at least sometimes when they leave their homes. Some Republican lawmakers have criticized mask mandates as evidence of government overreach, and some have branded those wearing masks as weak.