Demonstration of How Well Masks (Don't) Work (Long version)

COVID is spread by aerosols, not contact, not droplet. This was originally published 7/28/2020 on YouTube. They are now throttling the video.

Key point: The demonstration is designed to show WHERE aerosols go, not HOW MUCH gets through. It is a VISUAL demonstration anyone can do without high tech photography or instruments. It shows that masks are worthless as SOURCE CONTROL. There's no good way to show EXPOSURE CONTROL.