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Selfie. From left to right: Me, the 16 year-old, and [locally famous Radio Gal] on a sunny summer evening.
Same Idea or Different?

Same Idea or Different?

I am currently writing the teacher guide for my next book, How Did You Count? (See a couple of teaser photos at the end of this post!) A section of a chapter of that teacher guide has the heading Seek to Understand and to Be Understood. Those who know my teaching...

wooden tiling turtles spill out of a canvas bag that itself has an image of four tiled turtles on it
A Very Mathy Gift List

A Very Mathy Gift List

I am obsessed with this shape toy I saw in the gift shop at the Science Museum of Minnesota last week. Seen from above in the first photo, the triangle looks like a triangle. Seen obliquely, we notice that the triangle is embossed on a half-sphere, and so the sides...

A sign on a light pole reads "Como Lake. 1.6 miles - 3200 steps around the lake"
A walk around the lake

A walk around the lake

A very snowy winter is turning to a long, slow spring here in Minnesota. It is the kind of spring that makes us joyful for sunny 45° days. So I went for a long walk Sunday afternoon. Together with a meaningful percentage of the population of the city of Saint Paul,...

a young child dips a marshmallow in a cup of cocoa
One Perfect Page

One Perfect Page

I have read a lot of books in the last year. There have been some lovely novels, a bit of nonfiction, parts of a textbook about the mathematics of patterns. Through it all, one page sticks out vividly in my memory, from Grace Lin's The Last Marshmallow. Simple....