researchers tried to keep everything else the same, other than where does it make whether people are encouraged to use a mask, and those have found that among those who have been told to wear a mask, they see less covid in their communities than those who are not wearing them. we can t be, or it is difficult to be sure exactly how much it helps, particularly in relation to other factors, but there is certainly enough evidence now that we can look at this and say that people wearing masks is going to reduce the potential harm and the potential rate of spread. we potential harm and the potential rate of spread. potential harm and the potential rate of spread. we know that good ventilation is rate of spread. we know that good ventilation is important rate of spread. we know that good ventilation is important to - rate of spread. we know that good ventilation is important to prevent| ventilation is important to prevent the spread of covid. i might be springing this on you a bit, but w
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