I have some N95s without valves and use them at times but mostly I use the green lightweight disposable masks. I realize exhalation and some inhalation passes outside their perimeters but I believe the masks offer some protection from the Wuhan coronavirus to others by capturing most of the minuscule droplets I exhale through it.
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"No one is more hated than he who speaks the truth." Plato
“To argue with a person who has renounced the use of reason is like administering medicine to the dead.” Thomas Paine
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