Something in the way of a public service message, since I'm probably not the only person about with a couple hundred books in their possession.

I was pawing through the back section, looking for one of my old textbooks when the corner of my mind noted that sun rays were making light spots on one of my books. This thought engaged the rest of my brain, since it was 2 am and in any case it would be all but impossible for sunlight to ever reach that particular book, due to the angles of the windows. I glared at the book for a full three seconds before I was willing to admit the evidence of my eyes.

One of my books had a lively crop of mold growing on it.

I don't know if it was the glue, the binding, the ink used to color the cover, whatever, something was growing a bumper crop. A rather hasty scan of the rest of my collection hasn't turned up a second blighted manuscript, but be wary of this threat.

I'll probably also have to rethink my long term plan of keeping my library and bedroom the same room. Meh. I'm sure someone would have put their foot down on that in any case.