Masks have become a critical part of our daily routine. Every time we leave the house, we have to go through the mental checklist: wallet, keys, phone, mask(s). But the efficacy of masks can vary a lot. With new and more contagious variants of the coronavirus circulating in California, some researchers say we may need to adjust how we’re masking up.
Washington Post Opinion: Everyone should be wearing N95 masks now
Popular Science: When are two masks better than one for preventing COVID-19?