Puzzle books I had as a kid often asked what the intersection of three cylinders looked like. Even looking at the answer in the back, I still had trouble seeing it. Making this video helped a lot. The Sketch Up … Read More
This is my first Sketch Up video. It is surprising how many shapes the cross-section of a cube can take on, and how hard they are to visualize (for most of us). The Sketch Up file I used is in … Read More
Visual Quadratic Reciprocity
This one’s harder.
Is teaching math to kids easy? Should any reasonably intelligent person who can do “plus, times, minus, and divide” be able to start teaching elementary math tomorrow, skipping college math and all those waste-of-time education classes? Could most smart people, … Read More
Sporcle game here. Name all the primes less than 100 in 3 minutes.
Practice with this Sporcle quiz — three minutes to count from one to twenty-five in base two. Let me know what you think. This is my first Sporcle Quiz ever.
Last night I went to see the play Truth Values: One Girl’s Romp Through MIT’s Male Math Maze, written and performed by Gioia De Cari. Gioia and I were friends at MIT – we both started the Math PhD program … Read More
I start this activity by handing out buckets of tiles (any small objects will do) and asking students to take 10. They can sort their ten tiles into any number of piles, and their “prize” is the product of the … Read More
I wrote this for a memorial service for Wendy in October 2008, which I was unable to attend. Wendy was my best friend in high school. The first time I met Wendy Soll, she was ten years old, and I … Read More