Arthur Harold Stone, who moved from the United Kingdom to the United States in 1939, tried to use American paper sandwiched between British binders and noticed that the paper squeezed out of the ...

Richard Margolin’s office isn’t the tidiest. The floor is cluttered with boxes of products and prototypes of the educational robots his company, Robokind, produces. A bookshelf is crammed with texts ...

Last week, YouTube’s resident mathematical mind-blower, Vi Hart, introduced many of us to the topological wonder that is the hexaflexagon. If you haven’t seen it yet, get your life in order and go ...

Remember the first time you saw a Möbius strip (the ring-shaped surface with only one side) and it felt like your world had been turned upside down? The hexaflexagon tends to have a similar effect.

A facebook posting reminded me of something I used a lot when I was in school and had forgotten all about them. We used them for sending secret messages to each other. I am talking about hexaflexagon.