“Mask Nerd” Aaron Collins on which masks offer the best protection against COVID-19 Self-described “Mask Nerd” Aaron Collins is an aerosol scientist who tests masks in his home laboratory and rates ...

MINNEAPOLIS — Aaron Collins is standing in his bathroom, holding a white mask to his face while stretching its straps to the back of his head. Here in the “lab” at his Minneapolis home, Collins is ...

Aaron Collins goes by the "Mask Nerd" now that his unofficial job is reviewing face masks in his bathroom. Collins, an aerosol expert, compiled a list of the best child-sized masks to protect against ...

The Centers for Disease Control and Prevention upgraded its guidance on face masks last week, encouraging people to use National Institute for Occupational Safety & Health-approved N95 respirators or ...