Mobius Strip Puzzles and a Mathematical Proof

Mobius strips are easy to make. Just glue one end of a strip of paper to the back side of the other end. Then you have a twisted strip. Lots of knitters make Mobius cowls as well. It’s a popular and cozy style. The author of some of the books I’ve used with students, mathematician […]

Fun With Blocks: Foundational Geometry

In the course of my teaching and tutoring experience, I’ve come across the fact that Americans often fall short of others in geometry1,2. Besides the fact of test scores, I see that in how difficult it is for bright high school students I tutor to grasp certain spatial concepts. In fact, I was recently tutoring […]