What do you use for a bookmark?

I use whatever I have lying around. I found this card in another book, so it's now my bookmark. 🤷🏻‍♀️

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GlassDog · 41-45, M

It's an anti-static bag that a small hard disk came in.

Harmonium1923 · 51-55, M

@GlassDog That’s some hardcore math you’re doing.

GlassDog · 41-45, M

@Harmonium1923 It's from an encyclopaedia of science and tech. I try to read a few pages a day and learn something new. The sciences I know about are fine, but then there'll be an entry about sanitary engineering (?), the next one's about radiology, and then one about veterinary science. Still, at least I learned what a "cat cracker" is, in the field of mineral extraction.