October 2016 archive

Ball of Whacks

Update: I turned this into a full page:  Top 8 Interesting Things to Know about the Rhombic Triacontahedron Ball of Whacks is a geometry toy. (Available online and in toy stores that sell cool stuff.) It is a rhombic triacontahedron.  Each of the 30 rhombic faces are golden, in that the ratio of the diagonals …

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Prince Rupert’s cube

Cut a hole in one cube so that a cube of the same size (actually one slightly bigger!) can pas through. https://en.m.wikipedia.org/wiki/Prince_Rupert%27s_cube