Masks that are worse than a well-fitted N95 help with limiting spread when you go into a shop for 15 minutes. When you spend 8 hours in a crowded building with

Masks that are worse than a well-fitted N95 help with limiting spread when you go into a shop for 15 minutes. When you spend 8 hours in a crowded building with no ventilation, they do exactly nothing -- you will get full exposure regardless. Masks in schools are health theater.