https://coronavirus.medium.com/masks-work-cb25a52b05b1
If there’s one thing science is good at, it’s science. And the science says that even if you feel healthy, even if you feel silly for walking around with a mask on when you feel fine, if – if – you start showing signs a few days later, you’ll know that at a time when you could already have been infecting people around you – well, you weren’t. Instead of becoming the centre of your own personal outbreak, you just saved up to several hundred people from becoming infected.
So yeah – the mask on your face may not do much for you – but the masks on other people, they directly make you safer. And the mask on your face, making everyone feel like masks are a good thing, that makes everyone around you safe.