Let me take a one-day break from my current series of posts to wish everyone a Happy Pythagoras Day! Today is 7/24/25 (or 24/7/25 in other parts of the world), and $latex 7^2 = 24^2 + 25^2$. Bonus points if you can figure out (without Googling) when the next Pythagoras Days will be. Hint: It's…

Mean Green Math

29.07.2025

Higher derivatives in ordinary speech – Mean Green Math

Just about every calculus student is taught that the first derivative is useful for finding the slope of a curve and finding velocity from position, and that the second derivative is useful for finding the concavity of a curve and finding acceleration from position. I recently came across a couple of quotes that, taken literally,…

Mean Green Math

01.08.2025

High School Students Finding New Proofs of Old Theorems (Part 1): Dividing a line segment with straightedge and compass – Mean Green Math

This is one of my all-time favorite stories to share with students: how a couple of ninth graders in 1995 played with Geometer's Sketchpad and stumbled upon a brand-new way of using only a straightedge and compass to divide a line segment into any number of equal-sized parts. This article was published in 1997 and…

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Musical Scales – Mean Green Math

Happy Pythagoras Day! – Mean Green Math

Higher derivatives in ordinary speech – Mean Green Math

High School Students Finding New Proofs of Old Theorems (Part 1): Dividing a line segment with straightedge and compass – Mean Green Math

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