Will masks protect you against covid19?

Effectiveness of Surgical and Cotton Masks in Blocking SARS–CoV-2

https://www.acpjournals.org/doi/10.7326/M20-1342

Cloth masks dangerous to your health?

https://www.sciencedaily.com/releases/2015/04/150422121724.htm

New england Journal of Medicine

https://www.nejm.org/doi/full/10.1056/NEJMp2006372