We couldn’t make up a more 2020 problem if we tried: What do your kids do with their face masks when they take them off temporarily? If the fast-moving entrepreneurs who have mobilized to invent special face mask lanyards, extenders, ear savers and straps had studied biology in school, we’d probably have several COVID-19 vaccines to choose from by now. But as it is, we’ll have to settle for these clever offerings. As you shop for your kids’ back-to-school supplies in this strange new world, you might want to add some of these to your list.