- Looking for pictures of water coming out of a hose in a parabolic arc, I stumbled across this post about using geogebra to come up with an algebraic function that describes the path of the water.
- I have not yet ever taught Calc III. I'm thinking about working through this linear algebra based course, which pointed me to this video on higher dimensional spaces.
- The newest addictive game, 2048.
- Another cool looking site from NCTM, with a wide variety of math challenges.
- Cheesemonkey describes what gave her the courage to persist when learning involved lots of failures.
- How to inscribe a semicircle in a square, using geogebra.
- Gas Station Without Pumps thinks about what keeps women out of engineering.
- Some nice sine and cosine animations.
- 3D printing for hyperbolic honeycombs.
- How would you design a game, using only a fair coin, that you have a 1/3 chance of winning? No answers at the link, only thoughts about the value of hard questions.
- Nice challenge problems with exponents. Can you solve it without logarithms?
- More from This Old Train... on the roller coaster project. And a new project called Parametric Playground.

I still have too many tabs open, but the rest of them are not math...

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