When I was trying, some time in 1992, to level up my mathematics, I started to think about why squaring any rational was a piece of cake, and so you could draw the graph of x-squared almost without effort, but drawing the graph of the square root of x was really hard, unless you just geometrically flipped the graph of x-squared about the line y=x. It turns out that's a long story, ... David Turner Talking About Sixty Years of Functional Programming History and Eugenia Cheng on Monads, Monoids, Algebraic Theories and Models . Norman's done quite a lot of music videos in his maths series: See Chuck Berry's Weather Report December 10, 2020 . At the time I wrote that post I had no idea of the Scottish history of Darien: The History Guy on Panama's Scottish History , nor of the Callawayas in Paname: Nick Cave & The Bad Seeds "The jam" (One more time with feeling) . I did however know about Sean Connery's hat! So who makes these rules? See Darz R...