Don't get me wrong, I own lots of books, but the number which I've read more than once is small.
The only exceptions are
The tightwad gazette
Your Money or your Life
Asimov's robot/foundation novels
several how-to books, especially ones about electrical wiring
... and cookbooks, of course
I really like the book section of the goodwill in Olympia.
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It is by having hands that man is the most intelligent of animals - Anaxagoras