They use the word bacteria to refer to what look like molds to me.
Looks like a fun experiment though.
Wow. Simple but effective experiment.
This page keeps popping up the cookie consent box when I decline the cookies. It's literally unusable without bypassing it via Reader View.
Cookie Autodelete on FF might help you cleaning the cookies, e.g. 90 seconds after closing the page cookies get deleted.
NOT washing hands is important too. Letting a little bit of bacteria into your body strengthens the immune system. It is important to sometimes let your kids pick up food from the floor and eat it.