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Break out the calculators: November 23 is Fibonacci Sequence DayThe cornerstone of modern math wouldn’t be possible without the Hindu-Arabic numerical system.by Andrew Paulhttps://www.popsci.com/science/fibonacci-sequence-day-2025/Fibonacci at PG:https://www.gutenberg.org/ebooks/search/?query=fibonacci#books #mathematics #old_manuscripts

Tutivillus Is Watching YouFor medieval scribes, mistakes couldn’t be easily shrugged off, as Tutivillus, the stickler demon, was always looking over their shoulders.By: Amelia Soth https://daily.jstor.org/tutivillus-is-watching-you/Medieval manuscripts at PG:https://www.gutenberg.org/ebooks/subjects/search/?query=medieval+manuscripts#books #old_manuscripts