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A 5-minute video by 3Blue1Brown about recreational mathematics, on the Mathematics shelf. A commenter in r/CasualConversation recommended it.
3Blue1Brown, Video, 5 min, 2019, on the Mathematics shelf
A counting puzzle about colliding blocks whose answer unexpectedly produces digits of pi.
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a better way to countjan MisaliRecommended in r/CasualConversation
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But what is the Fourier Transform? A visual introduction.3Blue1BrownMentioned in r/ElectricalEngineering
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Group theory, abstraction, and the 196,883-dimensional monster3Blue1BrownMentioned in r/compsci