This is from back in April. Quotes a double blind scientific study about them. The masks are designed to block bacteria, not virus. I like the example that trying to block the virus with a mask is kind of like trying to keep the mosquito's out of your patio by putting up chicken wire.

He does say "unless someone makes everyone wear masks", and "soommme protection", so he must think they at least do something. So something for everyone on either side of the fence.

Very short video.

https://www.youtube.com/watch?v=SLPRBCNIkCY

John