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This one is a little bit of a homework assignment. Look through your office and your home and find all the books that have a bookmark in them indicating you’re intending to finish that book one day. (If it’s just marking a spot you want to reference, that doesn’t count.)
My results: Home = 36, Work = 7
(I’ve been reorganizing my collection and decided to collect all the books I’m in the middle of onto a single shelf. Turns out I needed more than one.)