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An 8-minute video by Be Smart about recreational mathematics, on the Mathematics shelf. A commenter in r/CasualConversation recommended it.
Be Smart, Video, 8 min, 2018, on the Mathematics shelf
A mental algorithm for finding the weekday of any date.
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How Many Holes Does a Human Have?VsauceRecommended in r/CasualConversation
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The most unexpected answer to a counting puzzle3Blue1BrownRecommended in r/CasualConversation
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The Josephus Problem - NumberphileNumberphileRecommended in r/CasualConversation
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What's The Largest Sofa That Can Fit Around a Corner?Up and AtomRecommended in r/CasualConversation
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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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Why slicing a cone gives an ellipse (beautiful proof)3Blue1BrownMentioned in r/3Blue1Brown
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Group theory, abstraction, and the 196,883-dimensional monster3Blue1BrownMentioned in r/compsci