The Haberdasher's Puzzle is a geometric dissection generally attributed to the English puzzle expert Henry Ernest Dudeney (1857-1930), in...

This is a brief update to my previous post on Aart van Breda . Since publishing the original post I've been informed by Michel Grand that...

Here's an unusual envelope fold that demonstrates a couple of mathematical points relating to triangles. Maths is not my strong suit, but...