ELI5 Face Masks - surgical vs N95, what's the difference?

What are the different types of mask folks are buying to help prevent respiratory illnesses like the corona virus? What is NIOSH?   ... We explain like i'm five!   Thank you to Empower, the sponsor of today's episode. For more info about Empower, visit: empower.me/ELI5     Thank you to the r/explainlikeimfive community as always and in particular the following users whose questions and comments formed the basis of this discussion: gudforthem, jihnen14880 & annunzim. To the ELI5 community that has supported us so far, thanks for all your feedback and comments. Send us an e-mail: [email protected]