There are some interesting benefits of wearing a mask. A parent recently told me that her youngster typically comes home during the first few weeks of school with a cold or flu. This year she hasn't. 

Another friend who has a family member who is a pediatrician at Children's Hospital in Pittsburgh says admissions are way down there. Children are not suffering complications related to colds, flu or other respiratory issues that are typical this time of year.

Another friend was asked by her boss why she was wearing her mask when she was alone in her office.  She's finding that her allergies are less troublesome and it seems it's due to wearing the mask.

Those personal stories are pretty convincing evidence that wearing a mask is effective. We really can slow the spread of Covid by simply wearing a mask.