 Good morning, Gary. How are you? I'm doing fine, doing fine. Fantastic. Tell everybody a little bit, I guess, what biofilm is, and then we'll get how it gets in our homes or trapped in different appliances and things. Sure. It's a fantastic question, and it's one of the more common ones. What is this odor or smell that I'm smelling from various different appliances? But in a nutshell, biofilm...