And as always, be sure to follow basic safety and health precautions, like updated vaccinations, masking, and air filtration.

Here's a great explanation of the Corsi–Rosenthal Box DIY air purifier you can easily make yourself.

https://en.wikipedia.org/wiki/Corsi%E2%80%93Rosenthal_Box

Stay safe!

See also: https://engineering.ucdavis.edu/news/science-action-how-build-corsi-rosenthal-box

Thank you, Uncle Biden!

Done. Hope they continue doing this.

Just four?

Yes, per household.

It's not much, barely even enough, but it definitely is something people should be taking advantage of.

Oh my, even per person that's barely enough to detect, and test if clear

Yep, it definitely is what it is.