If you show up in a gathering of 50 people, but only 5 people are wearing medical mask, they can apply social pressure reminding the other 45 people to take care of themselves, but actually they protect those 5 people.
If you show up in a gathering of 50 people, but only 5 people are wearing medical mask, they can apply social pressure reminding the other 45 people to take care of themselves, but actually they protect those 5 people.