As far as I'm concerned, you can chuck the other two N95 mask videos that I posted earlier. This one's way better than either of those.
It does, I'll warn you, have a statistically-backed, pro-BLM message at the front end. If you want to avoid the controversial subject, skip ahead to 0:10. (That being said, I'll be playing the full video in class, but that's your call to make in your room.)
From there, the minute physics video explains how N95 masks are less like a strainer or a screen and more like a sticky spider web. Those spider webs - in the N95 masks - are really sticky because of the van der Waals force and the permanent charge imbalance of the fibers.
Seriously, this video is the best at explaining how the masks work.
You should watch it...
...and (if you're reading this in 2020), you should wear a mask - even if it's not an N95 mask.
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