- Viaje a la cuarta dimension (Charla for FUNDAPROMAT en Agosto 13, 2020) (aquí en PDF)
- A website full of math-treasures.
- Mathematically correct breakfast by George Hart
- Project origami by Thomas Hull (handout are here "A More Complicated Fold"). See the GeogebraApp here.
- Alsoiby Thomas Hull, a modular origami dodecahedron.
- Bubbles and frames, a crowd pleaser.
- For young children, make platonic solids with marshmallows as vertices and toothpics as edges.
- Mobius band tricks.
- Geometry and the imagination, by Conway, Doyle, Gilman and Thurston.
- More ideas in Math Mondays
- Picture hanging
- Play Sprouts
- Suppose that you make a Mobius band glueing opposite sides of a rectangle. The pair of sides you glue have side length a, and the other pair have side length b. Can you make the ratio b/a smallest?
- Can you turn your pants inside out without taking your feet off the ground?
- http://sarajensen.org/knitting.html is a math course weaved with knitting.
- The Extraordinary Thurston Curve (illustrated by the movies below). Short explanation of how to draw it (with references) here.