There are countries - including in the EU - which made masks mandatory or highly recommended them. If "we" do not know how people behave when wearing masks, we

There are countries - including in the EU - which made masks mandatory or highly recommended them. If "we" do not know how people behave when wearing masks, we could simply ask them. Although we don't strictly need to ask them, since the head of the Chinese CDC said more than a month ago that using masks is essential and that he doesn't understand why Europe doesn't do it. KCDC specialists said much of the same thing, although I don't know if they expressed concern at Europe's lax attitude toward masks. And finally here's a couple of anecdotes: * people in supermarkets seem a bit more careful now, since the masks have been introduced. But keeping 1.5-2m distance at all times is hard and this is certainly not always respected. That's the whole point of why one needs masks instead of relying on distancing - distancing doesn't always work, but having a mask on is pretty simple. And even if the wearer screws up, at least they don't easily infect the others. * before the mandatory mask thing people generally got out of my way when they saw me with my mask on.