- Trisect the Angle (using origami axioms)
- Growth Mindset (a conversation with Neil deGrasse Tyson)
- Denise Gaskins on Understanding Math (She references an article by Richard Skemp that differentiates between 'instrumental' and 'relational' understanding.)
- What are sigma levels? (statistics)
- A new pentagon for tiling the plane
- Project Pentagon (Christopher Danielson is playing around, and thinking about the math.)
- Fundamental Theorem of Calculus with proofs and an applet
- What is a radian? (geogebra applet)
- Teaching students to work well in groups
- The Differentiation: A Survivor's Tale
- John Wallis, Pi, and Quantum Theory (I need to read this again, and the next one)
- Ramanujan and Fermat's Last Theorem
- Is 5x3 Five Threes or Three Fives? (Scientific American)
- Steven Strogatz, in Scientific American, on Einstein's First Proof (my favorite proof of the Pythagorean Theorem, based on symmetry)
- Using theater exercises to teach math (Malke would like this!)
- Trig graphs on Desmos (using their new activity builder)
- If you can't explain it, does that mean you don't understand it?
- What it means to slow down a (calculus) problem
- youcubed.org is Jo Boaler's new site (her new book is
*Mathematical Mindsets*, which I hope to review soon) - A video on the Konigsberg Bridges Problem
- Turtle Triangles (on programming using turtle)
- It takes courage to play in a world that does not play
- High school students playing with blocks (3D visual sequences)
- Making related rates relevant by using students' names
- Which one doesn't belong? (with polynomial functions)
- Pam Sorooshian on emotions and math
- A message to the aliens
- Kepler, Napier, and the Third law (I'm trying to learn more of the history of calculus, to help me teach calculus more effectively. This article is good.)
- Function flip books (I thought I was done, but twitter is dangerously good!)

**Games, Puzzles, & Problems**

- Chat Noir (Can you corral the cat? I did it once. Can't do it again.)
- Drips (a nim game)
- How many sides of a pentagon can you see?
- A very hard truth and lies logic puzzle
- Factor Grid (I wonder if I could make up my own versions of this)
- Some good problems of the week (this site changes each week)
- A simple trig challenge (I need to save this for my precalc class)
- Factory RatiosSpeed of sound
- Blermions (an approach to some geometry questions)
- Can you make this graph?

I have to admit that I skip the Intermediate Value Theorem when I teach Calc I (please tell me if you think I'm short-changing my students), but here are two great posts about it. If you ran a race at an average pace of 3:07 per kilometer, did you run any single kilometer in exactly 3:07? (from Scientific American) and an activity using Desmos (from Christopher Danielson).

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