If a store has a sign requesting that people wear masks I won't go inside. Interestingly, when I walked up to a store, saw the sign and started to walk away, an employee waved me on into the store. There were others inside not wearing masks.
Who is safer? A symptomatic person wearing a mask or an asymptomatic person not wearing a mask? Would you rather pick up a can of green beans that a symptomatic (sick) mask wearer had touched or would you rather pick up the can that an asymptomatic (not sick) non wearing mask person had touched?
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