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A few years ago, I helped a friend move an entire book collection that he'd bought from the seller's house to his house, and while waiting I flicked open one of the books, when I noticed a little insect crawling around. That's when I learnt about booklice. I can never look at old books the same way again, knowing that there might be bugs living in them.

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> Booklice are rarely damaging inside homes and are harmless to people or pets. Booklice usually feed on molds, fungi, grains, insect fragments, and other starchy material, including glue from bookbindings. In homes, psocids typically are found in damp, warm, undisturbed places where mold and fungi are growing.

Certainly having a yuck factor, but seems harmless? Perhaps even good if it eats mold?

Looking at Wikipedia, the air might have been too humid in the old house. Ventilating or heating might have helped.

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