Does anyone have thoughts on what these spots on my ceiling might be? I have tried to include sufficient pictures to illustrate, but there are roughly 20 spots like this in an area around 3-4 feet square. It doesn't look like mold to me and I thought if it was water damage it wouldn't pool in...

My kitchen backsplash is all glass mosaic tiles and I want to keep it as clean as possible. I do not fry too much but when I do, I would like to protect it from the splatters. I thought about buying a stainless steel plate and just lay it against the back of the stove when I need it but I...