Masks have been scientifically proven to help slow the spread of the virus or the expulsion of droplets from one's mouth. The wearing of masks are primarily to protect others from an infected person who is asymptomatic. CDC and WHO report that it is estimated that 40% or more of infected persons have no symptoms. On the Franklin D. Roosevelt Aircraft Carrier 350 of the 600 were asymptomatic. Businesses here in S. Florida will not let anyone in their place of business if they're not wearing a mask or face covering of some kind.