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Jan 14, 2022, 4:21 pm165 pts
Business InsiderClose-up of KF94 mask. unoL/Getty Images 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 COVID-19. His son's favorite mask is a KF94 made in South Korea, which…
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