This happened to me with RPN calculators. One day I realized I had way more calculators than I knew what to do with. Original HP's, re-released HP's, SwissMicros, not to mention the accompanying documentation I printed out and had spiral-bound. This all started out because I wanted a FOSS calculator to do some math for another rabbit hole I was down. Next thing I knew, I was getting excited about the life you'd get out of silver oxide batteries.
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