Miscellaneous teaching materials

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Here are a variety of teaching materials.

(Check out the Polyhedra Party repository for the polyhedra stuff especially.)

The flat surfaces, accompanying scissor and paper exercises.
Several views of the Klein bottle.
Make a genuine sphere, guaranteed. A little paper and scissors differential geometry that can’t go wrong!
Make yourself a piece of the hyperbolic plane!
A three page version of the Rosenthal Prize winning Tooti-Tooti. Try it out! A video is in the QR code.
The full Tooti Tooti lesson plan
A short history of the infinite
The Halting Problem is undecidable
A proof that every triangle is equilateral (based on Rouse Ball’s classic)
Four constructions of the pentagon
Prisoner’s Dilemma and the Tragedy of the Commons
100,000 dots
Tit for tat
Paradoxes
Some really big numbers
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