> If you are sick, masks are great. Even homemade ones. This is about healthy people wearing masks. First, masks work better when both sides use them. In Japa

> If you are sick, masks are great. Even homemade ones. This is about healthy people wearing masks. First, masks work better when both sides use them. In Japan, healthy people wear masks as well during flu seasons because it makes it offers better protection than wearing nothing. Second, in the specific context of COVID-19, how do you know they're healthy? That's the key, because asymptomatic cases are estimated to be the main driver of this pandemic by far. And it's only worsened by the fact that only few tests are available.