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One of the most amazingly useless things I recently learned is how to do subtraction, multiplication, and division on actual late-19th/early-20th Century adding machines. True adding machines, mind you, the kind that don't have any subtraction or other arithmetic functions built in.

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Computer Fairies

Computer Fairies is a Mastodon instance that aims to be as queer, friendly and furry as possible. We welcome all kinds of computer fairies!